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Overview

Brief Summary

New York Invasive Species Information

Problem

Japanese Stiltgrass (Microstegium vimineum), also known as Nepalese browntop and Asian stiltgrass, replaces native vegetation in a wide range of ecosystems including forested floodplains, forest edges, stream banks, fields, trails, and ditches as well as thriving as a weed in lawns and gardens. Japanese stiltgrass grows well in many light conditions (from deeply shaded hemlock forests to sunny open fields), prefers damp conditions, and often can be found in disturbed areas. It expands into dense stands of grass that prevent desirable vegetation from growing.

Areas infested with Japanese stiltgrass have decreased biodiversity. In addition to the early season plants that are typically crowded out by invasive species, late season grasses, sedges, and herbs are also affected. Infested areas also have an increased occurrence of other invasive plants and decreased native wildlife habitat and can provide good habitat for invasive animals including the cotton rat which can further affect local wildlife.

Japanese stiltgrass is not preferred by grazers such as white-tailed deer, goats and horses, which adds to its ability to out compete native, preferred vegetation. A 2010 study by Pisula and Meiners indicates that Japanese stiltgrass has allelopathic potential to inhibit seed germination.

History

Japanese stiltgrass is an annual grass that is native to China, India, Japan, Korea, Malaysia, and the Caucasus Mountains. In 1919, it was introduced to North America, in Tennessee, most likely through its use as a packing material for porcelain around 1919. It is considered invasive in Europe, Africa, Australia, New Zealand, South America, Mexico, and many island nations. Japanese Stiltgrass has extended its range into Asian countries surrounding its native range including Turkey, Nepal and Pakistan.

It is currently found in 24 eastern states from New York to Florida to Texas and Puerto Rico. As of summer 2011, New York has 16 counties reporting Stiltgrass invasions. Also, it is commonly found in association with other invasive plants including garlic mustard (Alliaria petiolata), Lady’s thumb (Persicaria maculosa), Japanese honeysuckle (Lonicera japonica) and Japanese barberry (Berberis thunbergii).

Habitat

Japanese stiltgrass is able to establish and thrive in a wide range of habitats, and is most often associated with acidic to neutral, moist soils that are high in nitrogen. After disturbance, Japanese stiltgrass readily takes advantage of shaded areas, but can proliferate in sunny openings as well. Causes of disturbance include scouring floods and soil disturbing activity such as the use of heavy equipment (especially logging), tilling, mowing, construction activities, and heavy animal impact, including that from white-tailed deer.

Biology and Description

Japanese stiltgrass resembles a small, delicate bamboo and has a sprawling habit. It grows up to 3.5 feet tall. The leaves are 1-3 inches long, asymmetrical with an off-center mid-rib, and are alternately arranged on the stalk. Each lance-shaped leaf has a noticeable stripe of silvery, reflective hairs down the length of the upper leaf surface. Unlike most native grass leaves which are rough in one direction when rubbed, Japanese Stiltgrass leaves are smooth in both directions.

In late summer and early fall, one or two delicate flower spikes form at the top of each stem. Each spike of flowers (inflorescence) can either require pollination or be self-fertile depending on soil moisture and sunlight availability. Individual plants can produce between 100 and 1000 seeds. Once those seeds mature the plant dies. Seeds can remain in the soil bank for at least 3 years. Japanese stiltgrass seeds readily germinate after a disturbance.

Japanese siltgrass spreads over large areas through transportation of those seeds, primarily through the movement of soil, overland water movement, water movement through ditches and streams, and on the feet of animals and humans. Japanese stiltgrass also stolons; rooting at the node joints along the stem, producing new stems. Stolon (or tillering) spread does die off each year, but increases the number of flower spikes on a plant.

Management and Control

Before enacting management practices, be sure to properly identify the grass. There are a few native look-alikes that can be found in association with Japanese stiltgrass (or on their own). Virginia cutgrass (white grass), Leersia virginica, Pennsylvania knotweed, Polygonum persicaria, and some other fine grasses have similar morphology. The unique line of silvery hairs found on the midrib of Japanese stiltgrass is a quick identifier.

Prevention

To minimize the chances of a Japanese stiltgrass infestation, limit disturbing areas and remediate disturbed soils quickly.

Manual/Mechanical Control

Hand pulling of Japanese stiltgrass can be effective for small populations, which is why early detection and rapid response is so important. It is shallow rooted and generally easy to pull. Pull in late summer, ideally before seed set. Pulled plants without seeds can be left on-site; if seeds have formed the plants should be removed. Pulling in late summer allows Japanese stiltgrass seeds in the seed bank to germinate but does not leave enough growing season for them to establish. Do not pull before July as seeds previously left in the seed bank can grow and go to seed.

Populations of Japanese stiltgrass can also be mowed while the plants are in flower but before seed set, late summer to early fall. Mowing will set the plants back, but mowing too early will result in the plants still being able to flower and go to seed.

Soil tilling of infested areas may also be effective. Proceed with the same restrictions as above. Tilling may not be appropriate for all sites.

Due to the length of time seeds are viable in the seed bank sites must be managed and monitored for multiple years. Hand pulling, mowing and tilling all create disturbances and should be followed with site remediation practices.

Chemical Control

Systemic herbicides can be an interim control of larger Japanese stiltgrass infestations. In the long term, conditions must be altered to prevent reintroduction of Japanese stiltgrass and other invasive plants. Choosing grass specific herbicides over broad-spectrum herbicides can help prevent mortality of non-target plants.

Post-emergent and pre-emergent herbicides have been proven effective. Post-emergent herbicides are applied when the plant is in full leaf and ideally before seed set. Pre-emergent herbicides can be applied at intervals throughout the growing season to prevent germination of Japanese Stiltgrass seeds in the spring as well as when the soil is disturbed so there is potential for additional germination times. Combinations of post and pre-emergent herbicides are viewed as a good tactic, along with continual monitoring for seed germination.

There are reports of Japanese stiltgrass populations becoming resistant to herbicides over time as natural selection allows the more resistant plants to survive and reproduce.

Alternative Methods of Control

The New York State Office of Parks, Recreation and Historic Preservation has been battling Japanese stiltgrass for many years in some of its Parks and has developed a couple new/experimental control techniques. Park Biologists have proven that covering stiltgrass with 4-6 inches of mulch (chips, leaf litter) will prevent stiltgrass from emerging (OPRHP Minnewaska State Park Preserve Experiment, 2010, 2011, and Connequot State Park Preserve, 2011). They found that seeding directly into the decomposing layer will reduce future Japanese stitgrass invasions. This treatment is suitable for treating trailside infestations and easily accessible small and mid-sized patches.

Japanese stiltgrass is also not very cold tolerant. Experiments show that using cold temperatures, or dry ice, in late August kills Japanese stiltgrass and may prevent reinvasion for a few years (OPRHP Minnewaska SPP, 2006). Positively, natives are able to recover in the same year as treatment. This experiment has not yet been replicated on a large scale.

Restoration

Seeding with annual rye can be a temporary restoration practice and is a recommended first stage of complete restoration. Annual rye competes with Japanese Stiltgrass enough to allow natives in the seed bank to propagate. Once Japanese Stiltgrass has been suppressed for a number of years and natives have a chance to outcompete it then a formal native planting should occur. If applicable to the site, Virginia cutgrass (Leersia virginica ) and jewelweed (Impatiens capensis) are competitive native plants to consider during restoration.

Reviewed by: Alyssa Reid, Invasive Species Field Supervisor, and Robert T. O' Brien, Invasive Species Control Field Director, NYS OPRHP - Environmental Management Bureau, Minnewaska State Park Preserve.

  • Alyssa Reid, Invasive Species Field Supervisor, NYS OPRHP - Environmental Management Bureau, Minnewaska State Park Preserve. E-mail conversation. January 4, 2012.
  • Center for Invasive Species and Ecosystem Health
  • Fryer, Janet L. 2011. Microstegium vimineum. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: http://www.fs.fed.us/database/feis/ [2011, October 17].
  • Invasive Plant Atlas: http://www.invasiveplantatlas.org/subject.html?sub=3051 (8/25/2011)
  • National Invasive Species Information Center http://www.invasivespeciesinfo.gov/plants/stiltgrass.shtml (8/25/2011)
  • PISULA, N. L. AND S. J. MEINERS. Relative allelopathic potential of invasive plant species in a young disturbed woodland. J. Torrey Bot. Soc. 137: 81–87. 2010
  • Plant Conservation Alliance’s Alien Plant Working Group Least Wanted Japanese Stiltgrass Fact Sheet. Authors Jil M. Swearingen, National Park Service, Center for Urban Ecology, Washington, DC, Sheherezade Adams, University of Maryland, Frostburg, MD. http://www.nps.gov/plants/alien/fact/mivi1.htm (10/17/2011)
  • Plant Invaders of Mid-Atlantic Natural Areas. Swearingen, J., K. Reshetiloff, B. Slattery, and S. Zwicker. 2002. Plant Invaders of Mid-Atlantic Natural Areas. National Park Service and U.S. Fish & Wildlife Service, 82 pp
  • Robert T. O' Brien, Invasive Species Control Field Director, NYS OPRHP - Environmental Management Bureau, Minnewaska State Park Preserve. E-mail conversation. January 4, 2012.
  • http://www.invasive.org/browse/subinfo.cfm?sub=3051 (8/27/2011)
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History in the United States

First documented in Tennessee around 1919, stiltgrass may have accidentally escaped as a result of its use as a packing material for porcelain.

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U.S. National Park Service Weeds Gone Wild website

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Comprehensive Description

Comments

Because of its paired spikelets, Japanese Stiltgrass (Microstegium vimineum) belongs to the same tribe of grasses, the Andropogoneae, as such prairie grasses as Big Bluestem (Andropogon gerardii) and Little Bluestem (Schizachyrium scoparium). Unlike these species, it is not a bunchgrass, instead forming a turf or mat like many lawn grasses. Especially during the vegetative state, it is possible to confuse Japanese Stiltgrass with the native White Grass (Leersia virginica); both grasses prefer similar habitats. While the inflorescences of these two grasses are fairly similar in appearance, there are important differences between them. White Grass does not produce its spikelets in pairs (there are no pediceled spikelets), and its spikelets are smaller (3.0-4.0 mm. in length). The spikelets of White Grass are unusual in that they lack glumes, possessing only a lemma and palea. In contrast, the spikelets of Japanese Stiltgrass have paired glumes that largely hide the lemmas from view. Another difference is that White Grass is a perennial that blooms a little earlier in the year (typically mid- to late summer), while Japanese Stiltgrass is an annual that blooms during the fall. Other scientific names for Japanese Stiltgrass include Eulalia viminea and Andropogon vimineus; these latter two names are regarded as obsolete. This non-native grass can be considered highly invasive of both disturbed and natural areas in Illinois and other states in eastern North America.
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© John Hilty

Source: Illinois Wildflowers

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Description

This grass is a summer annual that becomes 1½-3¼' tall at maturity. The culms are branched and decumbent below, while above they are mostly unbranched and more or less erect. The culms are light green to reddish purple, glabrous, and terete. Several alternate leaves occur along the entire length of each culm and its subdivisions. The blades of these leaves are 1¼-4" long, ¼-½" (6-12 mm.) across, and flat; they are linear-elliptic in shape with entire margins. The blade bases are narrowly cuneate (wedge-shaped), while their tips are acute. The upper blade surfaces are green and glabrous to sparsely hairy toward their bases, while the lower blade surfaces are similar, except they are pale green. Leaf sheaths are pale green, longitudinally veined, and mostly glabrous, except toward their apices, where they are hairy. The margins of the leaf sheaths are usually ciliate. The internodes are longer than the sheaths. The nodes are slightly swollen and glabrous, while the ligules are short-membranous and about 1 mm. in length. Toward the apex of each culm, an inflorescence develops that consists of 1-6 exerted racemes of spikelets. When several racemes are present, they are organized partially into a fan-like (digitate) cluster. Individual racemes are 1¼-3" long, consisting of several pairs of erect spikelets. For each pair of spikelets, one spikelet is sessile, while the other spikelet has a short hairy pedicel (1.5-4.0 mm. in length). The spikelets are 4.5-6.0 mm. in length and single-flowered. Each spikelet consists of 2 glumes, 1 fertile lemma, and a perfect floret with 3 anthers. The glumes are 4.5-6.0 mm. in length, narrowly lanceolate, longitudinally veined, and ciliate along their margins. The lemma is much smaller and hidden by the glumes. The lemma is either awnless or it has an awn about 2-8 mm. in length; sometimes the awn is hidden by the glumes. In addition to the exerted racemes, several inserted racemes are produced that remain hidden within the upper sheaths. The exerted racemes are chasmogamous and cross-pollinated by the wind, while the inserted sheaths are cleistogamous and self-fertile. The blooming period occurs during early to mid-fall. Afterwards, ellipsoid grains develop that become 2.5-3.0 mm. in length at maturity. The grains are dispersed later in the fall with their lemmas (whether awned or awnless); they can be blown about by the wind or float on water. The root system is fibrous. This grass can spread vegetatively by forming new rootlets when the nodes of the decumbent culms remain in contact with moist soil. As a result, this grass often forms colonies of plants.
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Source: Illinois Wildflowers

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Distribution

Range and Habitat in Illinois

The non-native Japanese Stiltgrass occurs in southern Illinois at scattered locations, where it can be locally common. It was accidentally introduced into the United States from east Asia during the early 20th century, when it was first observed in Tennessee. This grass appears to be spreading in both disturbed and natural areas. Habitats include thinly wooded sandstone canyons, floodplain woodlands and riverbanks, woodland openings and borders, disturbed open woodlands, tree plantations, abandoned land that was mined, grassy areas in parks and around parking lots, and roadsides. While wildfire can kill this grass, it can reseed itself and become re-established.
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© John Hilty

Source: Illinois Wildflowers

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National Distribution

United States

Origin: Exotic

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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© NatureServe

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Global Range: Introduced from Asia. USA: VA, NC, KY, TN, AL.

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Japanese stiltgrass is native to Japan, Korea, China, Malaysia, India, and the Caucasus Mountains [59,71,128,141,220]. It has invaded portions of Asia where it is nonnative, extending its range into Pakistan, Nepal [72], and Turkey [178]. Japanese stiltgrass is nonnative in the United States and Mexico; Europe; Australia and New Zealand; Africa; South America; and islands of the Atlantic, Pacific, and Indian oceans [220].

In the United States, it is sporadically distributed throughout most of the East and in the Caribbean, from New York south to Texas, Florida, Puerto Rico, and the Virgin Islands [58,71,97]. Japanese stiltgrass was first noted in North America around 1918 in Tennessee [15,51], where it was probably introduced accidentally [51]. It was formerly used as packing material for imported Chinese porcelain, and discarded packaging material containing seeds might have been the source of introduction [214]. Japanese stiltgrass is rare in Florida and other parts of the Southeast [164,230] but is rapidly increasing in Maryland, New York, and other northern states [15,90,169]. It was introduced in New Jersey around 1959 and spread rapidly in that state in the 1990s and 2000s (review by [5]). Roads and waterways appear to be the primary corridors for population expansion [90]; see Site Characteristics and Impacts for information. Plants database provides a map of Japanese stiltgrass distribution in the United States.

  • 128. Mohlenbrock, Robert H. 1986. Guide to the vascular flora of Illinois. Revised edition. Carbondale, IL: Southern Illinois University Press. 507 p. [17383]
  • 141. Ohwi, Jisaburo. 1965. Flora of Japan. Washington, DC: Smithsonian Institution. 1067 p. [50787]
  • 15. Barkworth, Mary E.; Capels, Kathleen M.; Long, Sandy; Piep, Michael B., eds. 2003. Flora of North America north of Mexico. Volume 25: Magnoliophyta: Commelinidae (in part): Poaceae, part 2. New York: Oxford University Press. 814 p. [68091]
  • 164. Radford, Albert E.; Ahles, Harry E.; Bell, C. Ritchie. 1968. Manual of the vascular flora of the Carolinas. Chapel Hill, NC: The University of North Carolina Press. 1183 p. [7606]
  • 169. Redman, Donnell E. 1995. Distribution and habitat types for Nepal microstegium [Microstegium vimineum (Trin.) Camus] in Maryland and the District of Columbia. Castanea. 60(3): 270-275. [44687]
  • 178. Scholz, Hildemar; Byfield, Andrew J. 2000. Three grasses new to Turkey. Turkish Journal of Botany. 24(4): 263-267. [44645]
  • 214. Virginia Department of Conservation and Recreation, Division of Natural Heritage. 2003. Invasive alien plant species of Virginia, [Online]. In: Natural Heritage Program--Invasive plants list. Richmond, VA: Virginia Department of Conservation and Recreation, Division of Natural Heritage; Virginia Native Plant Society (Producers). Available: http://www.dcr.virginia.gov/natural_heritage/documents/invlist.pdf [2009, March 23]. [44942]
  • 220. Weber, Ewald. 2003. Invasive plant species of the world: a reference guide to environmental weeds. Cambridge, MA: CABI Publishing. 548 p. [71904]
  • 230. Wunderlin, Richard P. 1998. Guide to the vascular plants of Florida. Gainesville, FL: University Press of Florida. 806 p. [28655]
  • 5. Ambrose, Jonathan P.; Bratton, Susan P. 1990. Trends in landscape heterogeneity along the borders of Great Smoky Mountains National Park. Conservation Biology. 4(2): 135-143. [76912]
  • 51. Ehrenfeld, Joan G. 2003. Soil properties and exotic plant invasions: a two-way street. In: Fosbroke, Sandra L. C.; Gottschalk, Kurt W., eds. Proceedings: U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species: 13th annual meeting; 2002 January 15-18; Annapolis, MD. Gen. Tech. Rep. NE-300. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 18-19. [44156]
  • 58. Fairbrothers, D. E.; Gray, J. R. 1972. Microstegium vimineum (Trin.) A. Camus (Gramineae) in the United States. Bulletin of the Torrey Botanical Club. 99(2): 97-100. [51503]
  • 59. Fernald, Merritt Lyndon. 1950. Gray's manual of botany. [Corrections supplied by R. C. Rollins]. Portland, OR: Dioscorides Press. 1632 p. (Dudley, Theodore R., gen. ed.; Biosystematics, Floristic & Phylogeny Series; vol. 2). [14935]
  • 71. Gleason, Henry A.; Cronquist, Arthur. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. 2nd ed. New York: New York Botanical Garden. 910 p. [20329]
  • 72. Goel, Anil K.; Uniyal, B. P. 1983. On the occurrence of a few grasses in Pakistan and Nepal. Journal of Economics, Taxonomy and Botany. 4(3): 1043. [44644]
  • 90. Hunt, David M.; Zaremba, Robert E. 1992. The northeastward spread of Microstegium vimineum (Poaceae) into New York and adjacent states. Rhodora. 94(878): 167-170. [44638]
  • 97. Kartesz, John T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. 1st ed. In: Kartesz, John T.; Meacham, Christopher A. Synthesis of the North American flora (Windows Version 1.0), [CD-ROM]. Chapel Hill, NC: North Carolina Botanical Garden (Producer). In cooperation with: The Nature Conservancy; U.S. Department of Agriculture, Natural Resources Conservation Service; U.S. Department of the Interior, Fish and Wildlife Service. [36715]

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Distribution in the United States

According to the WeedUS Database, Japanese stiltgrass has been reported to be invasive in natural areas in 15 eastern states inculding Connecticut, Delaware, Georgia, Indiana, Kentucky, Maryland, Massachusetts, New Jersey, New York, North Carolina, Pennsylvania, Tennessee, Virginia, West Virginia, and Washington, DC.

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U.S. National Park Service Weeds Gone Wild website

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Native Range

Japan, Korea, China, Malaysia and India
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U.S. National Park Service Weeds Gone Wild website

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Distribution and Habitat in the United States

Stiltgrass is currently established in 16 eastern states, from New York to Florida. It occurs on stream banks, river bluffs, floodplains, emergent and forested wetlands, moist woodlands, early successional fields, uplands, thickets, roadside ditches, and gas and power-line corridors. It can be found in full sun to deep shaded forest conditions and is associated with moist, rich soils that are acidic, neutral or basic and high in nitrogen.

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Origin

Japan, Korea, China, Malaysia and India

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Yunnan [NE India].
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Nepal, N.E. India to S.E. Asia, China, Korea, Japan.
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Distributed in Japan.
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Physical Description

Morphology

Description

More info for the terms: caryopsis, presence

This description provides characteristics that may be relevant to fire ecology and is not meant for identification. Keys for identification are available (for example, [15,71,92,128,141,164,230]).

Morphology: Japanese stiltgrass is an annual. It has a straggling to decumbent, loosely branched habit. Aerial culms are 3 to 5 feet (1-1.5 m) long [34,59,71,164]. They may be "wiry" and multibranched [56]. Japanese stiltgrass produces short to long (depending upon shading), spreading stolons. Intertwined stolons often form dense lawns. The leaves are cauline, with 0.5-inch (1 cm) wide and 3- to 4-inch (8-10 cm) long blades. The inflorescence is a 4.5 to 6 mm, terminal or axillary raceme bearing paired spikelets [34,59,71,164]. Terminal racemes bear chasmogamous flowers, while axillary racemes bear cleistogamous flowers [15]. The fruit is a 2.8- to 3.0-mm, ellipsoid caryopsis. Fruits often have twisted awns, although some fruits are awnless [34,59,71,164]. In New England collections, presence of awns varied within and among populations [58]. When present, awns are 3 to 8.5 mm long [220]. Root biomass of Japanese stiltgrass is  "remarkably small" compared to its aboveground biomass [51,53], and its roots are shallow [43,200]. A greenhouse study found that at the end of the growing season, Japanese stiltgrass roots were longest in dry (x=46 inches (18 cm)) soils compared to roots in soils of moderate (5 inches (13 cm)) and saturated (5.5 inches 14 cm)) water content. Lateral roots were few, averaging from 3 to 5 per plant [200]. Another greenhouse study found Japanese stiltgrass's roots were shallow and its root biomass was significantly less than its aboveground biomass (P<0.001), so the authors concluded Japanese stiltgrass in unlikely to access moisture in deep soil layers [200].

There has been confusion as to whether Japanese stiltgrass is sometimes perennial [50,51,124], but it is not. Mehrhoff [124] states that this confusion arose from misidentification of white grass—a morphologically similar native perennial—as Japanese stiltgrass. Japanese stiltgrass is distinguished from white grass, with which it often cooccurs, by its ciliate leaf sheath collar and paired spikelets (vs. white grass's glabrous to pubescent leaf sheath and one-flowered spikelets) [124].

Physiology: Japanese stiltgrass is adapted to low-light conditions [37,83,201]. Japanese stiltgrass uses C4 pathway photosynthesis. It is unusual for a C4 grass to photosynthesize efficiently under low light conditions, but Japanese stiltgrass is very shade tolerant [12,14,25,83,228] (see Successional Status). In the greenhouse, Winter and others [228] found Japanese stiltgrass grew well under 5% of full sunlight, and the photosynthetic rate of individual leaves was fully saturated at 25% of full sunlight. Dry-matter biomass production was similar under 18% to 100% of full sunlight. Japanese stiltgrass in the understory of a closed-canopy yellow-poplar-white oak forest in Great Smoky Mountains National Park took advantage of occasional, high-intensity sunflecks for optimal photosynthesis [83]. Best Japanese stiltgrass growth occurs on forest-grassland ecotones, where mean photosynthetically active radiation (PAR) is 35% [37]. Ueno [209] provides a description of Japanese stiltgrass's leaf physiology and cellular anatomy.

There are apparently genetic differences in shade tolerance among Japanese stiltgrass populations. Among 3 Japanese stiltgrass populations from Indiana grown in a growth chamber, 2 populations increased specific leaf area in response to shade, while the other did not [49].

Species response to increased levels of atmospheric carbon dioxide can affect plant community composition. High carbon dioxide levels may negatively affect Japanese stiltgrass compared to plant species better able to assimilate extra carbon dioxide. In field experiments in Tennessee, Belote and others [19] found that in a wet year, Japanese stiltgrass produced twice as much biomass under ambient carbon dioxide levels compared to elevated carbon dioxide levels (P=0.07). In a dry year, there was no significant difference in Japanese stiltgrass biomass between carbon dioxide treatments. In contrast, Japanese honeysuckle, a common nonnative associate of Japanese stiltgrass, produced 3 times as much biomass under elevated carbon dioxide levels in both wet and dry years [19].

  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 124. Mehrhoff, Leslie J. 2000. Perennial Microstegium vimineum (Poaceae): an apparent misidentification? Journal of the Torrey Botanical Society. 127(3): 251-254. [44651]
  • 128. Mohlenbrock, Robert H. 1986. Guide to the vascular flora of Illinois. Revised edition. Carbondale, IL: Southern Illinois University Press. 507 p. [17383]
  • 14. Barden, Lawrence S. 1996. The linear relation between stand yield and integrated light in a shade-adapted annual grass. Bulletin of the Torrey Botanical Club. 123(2): 122-125. [44641]
  • 141. Ohwi, Jisaburo. 1965. Flora of Japan. Washington, DC: Smithsonian Institution. 1067 p. [50787]
  • 15. Barkworth, Mary E.; Capels, Kathleen M.; Long, Sandy; Piep, Michael B., eds. 2003. Flora of North America north of Mexico. Volume 25: Magnoliophyta: Commelinidae (in part): Poaceae, part 2. New York: Oxford University Press. 814 p. [68091]
  • 164. Radford, Albert E.; Ahles, Harry E.; Bell, C. Ritchie. 1968. Manual of the vascular flora of the Carolinas. Chapel Hill, NC: The University of North Carolina Press. 1183 p. [7606]
  • 19. Belote, R. Travis; Weltzin, Jake F.; Norby, Richard J. 2003. Response of an understory plant community to elevated [CO2] depends on differential responses of dominant invasive species and is mediated by soil water availability. New Phytologist. 161(3): 827-835. [49843]
  • 200. Touchette, Brant W.; Romanello, Genevieve A. 2010. Growth and water relations in a central North Carolina population of Microstegium vimineum (Trin.) A. Camus. Biological Invasions. 12(4): 893-903. [80725]
  • 201. Tu, Mandy. 2000. Element stewardship abstract: Microstegium vimineum, [Online]. In: Managment library--plants. In: The global invasive species team (GIST). Arlington, VA: The Nature Conservancy (Producer). Available: http://www.invasive.org/gist/esadocs/documnts/micrvim.pdf [2011, January 21]. [51450]
  • 209. Ueno, Osamu. 1995. Occurrence of distinctive cells in leaves of C4 species in Arthraxon and Microstegium (Andropogoneae-Poaceae) and the structural and immunocytochemical characterization of these cells. International Journal of Plant Science. 156(3): 270-289. [44653]
  • 220. Weber, Ewald. 2003. Invasive plant species of the world: a reference guide to environmental weeds. Cambridge, MA: CABI Publishing. 548 p. [71904]
  • 228. Winter, K.; Schmitt, M. R.; Edwards, G. E. 1982. Microstegium vimineum, a shade adapted C4 grass. Plant Science Letters. 24(3): 311-318. [44646]
  • 230. Wunderlin, Richard P. 1998. Guide to the vascular plants of Florida. Gainesville, FL: University Press of Florida. 806 p. [28655]
  • 25. Brown, Walter V. 1977. The Kranz syndrome and its subtypes in grass systematics. Memoirs of the Torrey Botanical Club. 23(3): 1-97. [51497]
  • 34. Claridge, Kevin; Franklin, Scott B. 2002. Compensation and plasticity in an invasive plant species. Biological Invasions. 4(4): 339-347. [49779]
  • 37. Cromer, Carolyn. 2003. Microstegium vimineum: how worried should we be? Light as a limiting factor in growth of M. vimineum and M. vimineum's effects on species diversity, [Online]. In: Defining a natural areas land ethic: 30th natural areas conference; 2003 September 24-27; Madison, WI. Program Abstracts. Bend, OR: Natural Areas Association (Producer) Available: http//64.92.126.53/03conference/NAA_ABSTRACTS/pdf [2005, February 8]. [51524]
  • 43. DeMeester, Julie Elizabeth. 2009. Feedbacks of nitrogen cycling and invasion with the non-native plant, Microstegium vimineum, in riparian wetlands. Durham, NC: Duke University. 136 p. Dissertation. [80518]
  • 49. Droste, Tyler; Flory, S. Luke; Clay, Keith. 2010. Variation for phenotypic plasticity among populations of an invasive exotic grass. Plant Ecology. 207(2): 297-306. [80571]
  • 50. Ehrenfeld, Joan G. 1999. A rhizomatous, perennial form of Microstegium vimineum (Trin.) A. Camus in New Jersey. Journal of the Torrey Botanical Society. 126(4): 352-358. [44643]
  • 51. Ehrenfeld, Joan G. 2003. Soil properties and exotic plant invasions: a two-way street. In: Fosbroke, Sandra L. C.; Gottschalk, Kurt W., eds. Proceedings: U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species: 13th annual meeting; 2002 January 15-18; Annapolis, MD. Gen. Tech. Rep. NE-300. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 18-19. [44156]
  • 53. Ehrenfeld, Joan G.; Kourtev, Peter; Huang, Weize. 2001. Changes in soil functions following invasions of exotic understory plants in deciduous forests. Ecological Applications. 11(5): 1287-1300. [44656]
  • 56. Evans, C. W.; Moorhead, D. J.; Bargeron, C. T.; Douce, G. K. 2006. Invasive plant responses to silvicultural practices in the South. Bugwood Network BW-2006-03. Tifton, GA: The University of Georgia Bugwood Network. 52 p. Available online: http://www.invasive.org/silvicsforinvasives.pdf [2010, December 2]. [72425]
  • 58. Fairbrothers, D. E.; Gray, J. R. 1972. Microstegium vimineum (Trin.) A. Camus (Gramineae) in the United States. Bulletin of the Torrey Botanical Club. 99(2): 97-100. [51503]
  • 59. Fernald, Merritt Lyndon. 1950. Gray's manual of botany. [Corrections supplied by R. C. Rollins]. Portland, OR: Dioscorides Press. 1632 p. (Dudley, Theodore R., gen. ed.; Biosystematics, Floristic & Phylogeny Series; vol. 2). [14935]
  • 71. Gleason, Henry A.; Cronquist, Arthur. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. 2nd ed. New York: New York Botanical Garden. 910 p. [20329]
  • 83. Horton, J. J.; Neufeld, H. S. 1998. Photosynthetic responses of Microstegium vimineum (Trin.) A. Camus, a shade-tolerant, C4 grass, to variable light environments. Oecologia. 114(1): 11-19. [44639]
  • 92. Jones, Stanley D.; Wipff, Joseph K.; Montgomery, Paul M. 1997. Vascular plants of Texas. Austin, TX: University of Texas Press. 404 p. [28762]

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Description

Japanese stiltgrass, or Nepalese browntop, is an annual grass with a sprawling habit. It germinates in spring and grows slowly through the summer months, ultimately reaching heights of 2 to 3½ ft. The leaves are pale green, lance-shaped, asymmetrical, 1 to 3 in. long, and have a distinctive shiny midrib. Slender stalks of tiny flowers are produced in late summer (August through September-early October) and dry fruits called achenes are produced soon afterwards.

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U.S. National Park Service Weeds Gone Wild website

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Description and Biology

  • Plant: annual grass resembling a small, delicate bamboo; mature plants grow to 2-3 ft. in height.
  • Leaves: pale green, lance-shaped, asymmetrical, about 3 in. in length, with a shiny midrib.
  • Flowers, fruits and seeds: hidden (cleistogamous), self-fertilizing flowers in axils and/or exposed (chasmogamous) flowers in terminal racemes of paired, hairy spikelets that open and are wind-pollinated; fruits awned and bristly; late summer to fall.
  • Spreads: by seed and vegetative spread by rooting at joints along the stem—a new plant can emerge from each node; a single plant can produce 100-1,000 seeds that remain viable in the soil for at least three years, ensuring its persistence; seed germinates readily following soil disturbance. Although dispersal is not fully understood, seeds can be transported by water (e.g., surface runoff, streams, and floodwaters), in soil and gravel, in nursery grown plants, and on the feet of animals including humans.
  • Look-alikes: Virginia cutgrass (Leersia virginica), hairy jointgrass or small carpetgrass (Arthraxon hispidus), and possibly other delicate grasses and wildflowers like Pennsylvania knotweed (Polygonum persicaria).

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Description

Culm geniculate at the basal node, about 1 mm thick. Blade about 4.5 cm long by 6-7 mm wide, tomentose, especially on the back; ligule 0.3-0.4 mm long, hispid on the back. Racemes 1-3, subdigitately arranged, about 5 cm long. Spikelets paired, monomorphic, the upper pedicellate, the lower sessile, about 4.5 mm long; rachis-joint shorter than the spikelet. Lower glume chartaceous, lanceolate, as long as the spikelet, 2-keeled, scabrous on keels, margins fimbriate, nerves anastomosing; upper glume deltoid;lanceolate, 1-keeled, pointed, margins membranous, inrolled and fimbriate; lower lemma hyaline; lanceolate or linear, acute or 2-cleft, about 3 mm long; upper lemma deltoid, chartaceous, about 1 mm long with an awn of about 4 mm long, arising from the apex; upper palea lanceolate-deltoid, about 1.2 mm long, chartaceous. Caryopsis about 3.5 mm long; embryo 1/2 the length of the caryopsis. . Distributed from Northeastern India to South-eastern Asia, China and Japan.
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Physical Description

Annuals, Terrestrial, not aquatic, Stems trailing, spreading or prostrate, Stems nodes swollen or brittle, Stems geniculate, decumbent, or lax, sometimes rooting at nodes, Stems mat or turf forming, Stems terete, round in cross section, or polygonal, Stems branching above base or distally at nodes, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichous, Leaves pseudo-petiolate, petiole attached to sheath, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath hairy, hispid or prickly, Leaf sheath hairy at summit, throat, or collar, Leaf sheath and bla de differentiated, Leaf blades linear, Leaf blades lanceolate, Leaf blades 2-10 mm wide, Leaf blades 1-2 cm wide, Leaf blades mostly flat, Leaf blades more or less hairy, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal, Inflorescence a dense slender spike-like panicle or raceme, branches contracted, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence a panicle with narrowly racemose or spicate branches, Inflorescence a panicle with digitately arranged spicate branches, Inflorescence single raceme, fascicle or spike, Inflorescence with 2-10 branches, Inflorescence branches paired or digitate at a single node, Flowers bisexual, Spikelets pedicellate, Spikelets sessile or subsessile, Spikelets dorsally compressed or terete, Inflorescence or spikelets partially hidden in leaf sheaths, subtended by spatheole, Spikelet less than 3 mm wide, Spikelets with 2 florets, Spikelets paired at rachis no des, Spikelets all alike and fertille, Spikelets in paired units, 1 sessile, 1 pedicellate, Pedicellate spikelet well developed, staminate, Spikelets bisexual, Spikelets unisexual, Spikelets disarticulating below the glumes, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes equal to or longer than adjacent lemma, Glumes keeled or winged, Glumes 4-7 nerved, Glumes 2-5 toothed, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma glabrous, Lemma apex dentate, 2-fid, Lemma awnless, Lemma mucronate, very shortly beaked or awned, less than 1-2 mm, Lemma margins thin, lying flat, Lemma straight, Palea membranous, hyaline, Palea about equal to lemma, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis.
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Dr. David Bogler

Source: USDA NRCS PLANTS Database

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Description

Annual. Culms very slender, weak, decumbent, up to 50 cm tall. Leaf sheaths glabrous, without cleistogamous spikelets; leaf blades lanceolate to narrowly ovate, thin, 5–6 × 0.8–1.2 cm, pilose with tubercle-based hairs, base narrow, apex acute; ligule ca. 0.8 mm. Racemes 1–3(–4), 3–5 cm; rachis internodes linear-clavate, ciliolate or glabrous. Sessile spikelet 5–6 mm, pallid with green veins; lower glume cartilaginous, back grooved, smooth or minutely scaberulous, flanks keeled above middle, veins reticulately connected by veinlets below apex and along most of length of glume flanks; upper glume smooth, acuminate; lower floret reduced to a small lanceolate scale; upper lemma lanceolate, ca. 1.5 mm, acute, awnless; upper palea ovate, 0.5–0.8 mm. Anthers 3, ca. 0.5 mm. Fl. and fr. Sep–Oct.
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Description

Annual. Culms decumbent, up to 1 m long. Leaf sheaths shorter than internodes, upper usually enclosing cleistogamous spikelets; leaf blades narrowly elliptic, 4–9 × 0.5–0.8 cm, pubescent, often sparsely, midvein white, apex acuminate; ligule ca. 0.5 mm. Racemes 1–6, ascending, 4–6 cm; rachis internodes linear-clavate, ciliate, shorter than spikelet. Sessile spikelet 4–5.5 mm; lower glume narrowly lanceolate-oblong, back deeply grooved, puberulous-scaberulous or occasionally hispidulous, 0–4-veined between keels, veins connected by veinlets below apex, apex subtruncate; upper glume scabrid on keel, acuminate; lower floret reduced to an inconspicuous linear-lanceolate scale or absent; upper lemma lanceolate or oblong, 1–1.5 mm, acute or bidenticulate, awnless or shortly awned; awn weakly geniculate, often included within spikelet, up to 6(–9) mm; upper palea ovate, ca. 1 mm. Anthers 3, 0.5–1.5 mm. Fl. and fr. Aug–Nov.
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Elevation Range

700-1800 m
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Description

Culm geniculate, about 2 mm in diameter, hard. Blade 7-8 cm long by 10 mm wide, hirsute on both surfaces; ligule rounded at the upper part, about 1 mm long, hispid on the back; sheath margins and sheath-mouth densely ciliate. Inflorescence of 3 racemes subdigitately arranged. Spikelets paired, monomorphic; the upper pedicellate, the pedicels nearly as long as the spikelet; the lower sessile 4.5-5 mm long; rachis and pedicel slender, ciliate on margins. Glumes subcoriaceous, as long as the spikelet, the lower linear-lanceolate, 2-keeled, shortly ciliate on keels, the upper deltoid, 1-keeled, acute, upper fioret minute, about 1-1.5 mm long; lemma linear, chartaceous, about 1 mm long, with an awn of about 3.5 mm long, arising from the tip of the lemma; palea membranous, lanceolate about 1.5 mm long. Caryopsis cylindrical, about 1.5 mm long; embryo 1/2 the length of the caryopsis.
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Diagnostic Description

Synonym

Andropogon vimineus Trinius, Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2: 268. 1833; Arthraxon nodosus Komarov; Eulalia cantonensis (Rendle) Hitchcock; Microstegium cantonense (Rendle) A. Camus; M. dilatatum Koidzumi; M. imberbe (Nees ex Steudel) Tzvelev; M. nodosum (Komarov) Tzvelev; M. vimineum subsp. nodosum (Komarov) Tzvelev; M. vimineum var. imberbe (Nees ex Steudel) Honda; M. vimineum var. willdenowianum (Nees ex Steudel) Sur; M. willdenowianum Nees ex Steudel; Pollinia cantonensis Rendle; P. imberbis Nees ex Steudel; P. imberbis var. willdenowiana (Nees ex Steudel) Hackel; P. viminea (Trinius) Merrill; P. willdenowiana (Nees ex Steudel) Bentham.
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Synonym

Andropogon vimineus Trin., Mem. Acad. St. Petersb. VI. Math, Phys. Nat. 2: 268. 1832.
 Microstegium vimmeum var. polystachum (Fr. & Sav.) Ohwi, Act. Phytotax. Geobot 11: 156. 1942.
 Microstegium vimineum var. imberbe (Nees) Honda, Monogr., 408. 1930.
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Ecology

Habitat

Range and Habitat in Illinois

The non-native Japanese Stiltgrass occurs in southern Illinois at scattered locations, where it can be locally common. It was accidentally introduced into the United States from east Asia during the early 20th century, when it was first observed in Tennessee. This grass appears to be spreading in both disturbed and natural areas. Habitats include thinly wooded sandstone canyons, floodplain woodlands and riverbanks, woodland openings and borders, disturbed open woodlands, tree plantations, abandoned land that was mined, grassy areas in parks and around parking lots, and roadsides. While wildfire can kill this grass, it can reseed itself and become re-established.
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© John Hilty

Source: Illinois Wildflowers

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Comments: Shaded banks and roadsides.

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© NatureServe

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Habitat characteristics

More info for the terms: cover, litter, presence

Japanese stiltgrass is common in disturbed areas [15,59,128] including roadsides, shorelines [59,128], floodplains [12], and "waste places" [59,128]. It is most common on disturbed soils at low to middle elevations and prefers moist, continental climates.

Japanese stiltgrass is strongly associated with disturbed forest sites, especially roads. The Virginia Department of Conservation and Recreation [215] stated that Japanese stiltgrass is common on disturbed soils and can rapidly spread onto undisturbed soils once established nearby. In white oak-eastern hemlock forests of Pennsylvania, Japanese stiltgrass was about 7 times more likely to occur on disturbed than on undisturbed sites [158]. In the Green Ridge State Forest, Maryland, Japanese stiltgrass presence was positively associated with disturbed soils (P<0.001) [130]. In sweetgum-sycamore and loblolly pine-white oak-sweetgum forests of Mississippi, Japanese stiltgrass was positively associated with canopy gaps and flooding (P<0.001 for both variables) [21]. On 2,000 sites within oak-hickory forests of western Virginia, Japanese stiltgrass cover was positively related to road length (P=0.04) and length of the road relative to total area of the watershed in which it occurred (P<0.001). Japanese stiltgrass was rare in forest interiors relative to its abundance on roadsides, and Japanese stiltgrass by roads gained more biomass than Japanese stiltgrass growing in forest interiors (P<0.001) [117].

In a seeding experiment in an oak-hickory-eastern white pine community in Pennsylvania, Nord and others [137] concluded that disturbance and soil properties were more important to successful Japanese stiltgrass invasion of a site than the plant community type. They found that litter disturbance increased Japanese stiltgrass population expansion for the first 2 years of Japanese stiltgrass invasion compared to sites with undisturbed litter (P<0.02) and that populations consistently declined on closed-canopy sites. Disturbance × environment interactions were not significant for Japanese stiltgrass population growth [137]. See Nutrients for more information on this study.

Soils: Japanese stiltgrass prefers damp or wet soils ([12], review by [215]), although it does not tolerate standing water for "extended periods" of time (review by [215]). It also establishes on dry upland soils [191]. On the Jefferson National Forest and in Mountain Lake Wilderness, Virginia, Japanese stiltgrass occupied either damp sites without standing water or sites with "highly disturbed" soils such as gravel and dirt mounds by roadsides [131]. In southern Ohio, Japanese stiltgrass was "particularly dense and vigorous" in swales and moist soil [32]. In a yellow-poplar-common persimmon-sweetgum forest in North Carolina, Japanese stiltgrass successfully "outcompeted" native understory species on floodplains and midslopes but not on upland sites [212]. In Florida, Japanese stiltgrass is common on wet hammocks [230]. In the greenhouse, Japanese stiltgrass's relative growth rate was fastest in soil with 30% water content (P<0.05), but it persisted and produced some seed in flooded soils and in soils with <10% water content. The authors attributed Japanese stiltgrass ability to invade a site, in part, on its ability to tolerate "contrasting and extreme soil water conditions" [200].

Japanese stiltgrass is common on silty to sandy loams [12,56,68,165] and on clays [56,90]. In deciduous wetlands of New Jersey, Japanese stiltgrass was positively correlated with percent clay in soil (P<0.05) [52]. Japanese stiltgrass an indicator of red clay soils in the Piedmont region [90].

Soil pH is usually mildly acidic to basic on sites with Japanese stiltgrass [56,68,201]. A survey in Maryland and Washington, DC, found that sites with Japanese stiltgrass ranged from pH 4.8 to 5.8 [169]. On mine spoils in Kentucky, Japanese stiltgrass grew on loamy soils with pH ranging from 4.6 to 6.3. It was absent from an extremely acidic site (pH 4.4) [165]. In an Illinois study, soils supporting Japanese stiltgrass were generally acidic and nutrient poor [68].

Some studies have found that Japanese stiltgrass was positively associated with basic soils [35,137] or that it raises soil pH [53]. In deciduous wetlands of New Jersey, Japanese stiltgrass was positively correlated with nonacidic soils (P<0.05) [52]. In white oak-eastern hemlock forests of Pennsylvania, sites most likely to support Japanese stiltgrass had basic soils and low understory cover [158]. Studies in Tennessee oak-pine [35] and New Jersey oak-hickory [100] forests showed high soil pH favors Japanese stiltgrass, while a study in a oak-hickory forest of southeastern Ohio showed no significant increases in Japanese stiltgrass abundance with lime additions to soil [69]. In mixed-hardwood forests of New Jersey, there was no significant relationship between Japanese stiltgrass invasion and soil pH [180].

Nutrients: Based on limited studies, Japanese stiltgrass may prefer soils with high mineral content. In an oak-hickory-eastern white pine community in Pennsylvania, phosphorus level (P=0.01), potassium level (P=0.01) moist soil (P<0.001), and high pH (P=0.002) were positively associated with Japanese stiltgrass abundance, while ammonium was negatively associated with Japanese stiltgrass abundance and seed production (P<0001) [137]. Studies in Maryland and Washington, DC, found higher levels of nitrogen and average levels of potassium and phosphorus on Japanese stiltgrass-infested soils compared to soils without Japanese stiltgrass [169]. In red maple forests of Arkansas, Japanese stiltgrass was positively correlated with high concentrations of soil boron (r=0.3) and zinc (r=0.5). In mixed-hardwood and oak-hickory forests of West Virginia, soils of interior plots with Japanese stiltgrass had significantly lower total carbon levels than plots without Japanese stiltgrass (P=0.07) [87]. In mixed-hardwood forests of New Jersey, however, sites where soils had high organic matter content were more susceptible to Japanese stiltgrass invasion than sites with low organic matter content [180].

Elevation and aspect: Japanese stiltgrass occurs from sea level up to 4,000 feet (1,000 m) elevation [56,125]. It is most common in low-elevation woodlands in the mid-Atlantic states and in the Piedmont and Appalachian mountains [164]. As of this writing (2010), it was not reported from high-elevation red spruce-Fraser fir (Picea rubens-Abies fraseri) forests. In mixed-hardwood communities in the Blue Ridge Mountains of North Carolina, Japanese stiltgrass was negatively correlated with high elevation (P<0.05) [104].

Few studies had been conducted on possible aspect preferences of Japanese stiltgrass as of 2010. In the Green Ridge State Forest, Maryland, Japanese stiltgrass presence was significantly positively associated with southwest (P<0.001) and northwest (P<0.05) aspects [130]. Japanese stiltgrass transplanted into canopy gaps in a New Jersey boxelder-green ash-sycamore forest showed better growth on the west side of the gaps compared to the east side [13].

Climate: Japanese stiltgrass grows in temperate to warm continental climates. In North America, the coldest reported winter temperatures that Japanese stiltgrass survives are approximately -5.8 to -9.4 °F (-21 to -23 °C) [169].

  • 100. Kourtev, P. S.; Ehrenfeld, J. G.; Huang, W. Z. 1998. Effects of exotic plant species on soil properties in hardwood forests of New Jersey. Water, Air, and Soil Pollution. 105(1/2): 493-501. [44650]
  • 104. Kuhman, Timothy R.; Pearson, Scott M.; Turner, Monica G. 2010. Effects of land-use history and the contemporary landscape on non-native plant invasion at local and regional scales in the forest-dominated southern Appalachians. Landscape Ecology. 25(9): 1433-1445. [80577]
  • 117. Manee, Christina Ann. 2008. The effect of roads on the distribution of Microstegium vimineum. Cullowhee, NC: Western Carolina University. 35 p. Thesis. [80514]
  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 125. Miller, James H. 2003. Nonnative invasive plants of southern forests: A field guide for identification and control. Gen. Tech. Rep. SRS-62. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 93 p. Available online: http://www.srs.fs.usda.gov/pubs/gtr/gtr_srs062/ [2004, December 10]. [50788]
  • 128. Mohlenbrock, Robert H. 1986. Guide to the vascular flora of Illinois. Revised edition. Carbondale, IL: Southern Illinois University Press. 507 p. [17383]
  • 13. Barden, Lawrence S. 1996. A comparison of growth efficiency of plants on the east and west sides of a forest canopy gap. Journal of the Torrey Botanical Club. 123(3): 240-242. [44648]
  • 130. Mortensen, David A.; Rauchert, Emily S. J.; Nord, Andre N.; Jones, Brian P. 2009. Forest roads facilitate the spread of invasive plants. Invasive Plant Science and Management. 2(3): 191-199. [76168]
  • 131. Murray, David Patrick. 2009. Spatial distribution of four exotic plants in relation to physical environmental factors with analysis using GIS. Blacksburg, VA: Virginia Polytechnic Institute and State University. 63 p. Thesis. [80651]
  • 137. Nord, Andrea N.; Mortensen, David A.; Rauschert, Emily S. J. 2010. Environmental factors influence early population growth of Japanese stiltgrass (Microstegium vimineum). Invasive Plant Science and Management. 3(1): 17-25. [80722]
  • 15. Barkworth, Mary E.; Capels, Kathleen M.; Long, Sandy; Piep, Michael B., eds. 2003. Flora of North America north of Mexico. Volume 25: Magnoliophyta: Commelinidae (in part): Poaceae, part 2. New York: Oxford University Press. 814 p. [68091]
  • 158. Peskin, Nora. 2005. Habitat suitability of Japanese stiltgrass Microstegium vimineum in an Appalachian forest. University Park, PA: The Pennsylvania State University. 136 p. Thesis. [80515]
  • 164. Radford, Albert E.; Ahles, Harry E.; Bell, C. Ritchie. 1968. Manual of the vascular flora of the Carolinas. Chapel Hill, NC: The University of North Carolina Press. 1183 p. [7606]
  • 165. Rafaill, Barbara L. 1988. Soil characteristics and vegetational features of abandoned and artificially revegetated surface mines in the Cumberland Mountains. Carbondale, IL: Southern Illinois University. 192 p. Dissertation. [49956]
  • 169. Redman, Donnell E. 1995. Distribution and habitat types for Nepal microstegium [Microstegium vimineum (Trin.) Camus] in Maryland and the District of Columbia. Castanea. 60(3): 270-275. [44687]
  • 180. Schramm, Jonathon William. 2008. Historical legacies, competition and dispersal control patterns of invasion by a non-native grass, Microstegium vimineum trin. (A. Camus). New Brunswick, NJ: The State University of New Jersey. 160 p. Dissertation. [80530]
  • 191. Swearingen, Jil M. 2004. Fact sheet: Japanese stilt grass--Microstegium vimineum (Trin.) Camus, [Online]. In: Weeds gone wild: Alien plant invaders of natural areas. Plant Conservation Alliance's Alien Plant Working Group (Producer). Available: http://www.nps.gov/plants/alien/fact/mivi1.htm [2004, December 10]. [51461]
  • 200. Touchette, Brant W.; Romanello, Genevieve A. 2010. Growth and water relations in a central North Carolina population of Microstegium vimineum (Trin.) A. Camus. Biological Invasions. 12(4): 893-903. [80725]
  • 201. Tu, Mandy. 2000. Element stewardship abstract: Microstegium vimineum, [Online]. In: Managment library--plants. In: The global invasive species team (GIST). Arlington, VA: The Nature Conservancy (Producer). Available: http://www.invasive.org/gist/esadocs/documnts/micrvim.pdf [2011, January 21]. [51450]
  • 21. Brewer, J. Stephen. 2010. A potential conflict between preserving regional plant diversity and biotic resistance to an invasive grass, Microstegium vimineum. Natural Areas Journal. 30(3): 279-293. [80709]
  • 212. Vidra, Rebecca L.; Shear, Theodore H.; Stucky, Jon M. 2007. Effects of vegetation removal on native understory recovery in an exotic-rich urban forest. Journal of the Torrey Botanical Society. 134(3): 410-419. [80726]
  • 215. Virginia Department of Conservation and Recreation, Natural Heritage Program. 2002. Species factsheet: Japanese stilt grass (Microstegium vimineum), [Online]. In: Invasive alien plant species of Virginia. Virginia Native Plant Society (Producer). Available: http://www.vnps.org/invasive/FSMICROS.html [2004, December 21]. [51526]
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Key Plant Community Associations

More info for the terms: alliance, cover, forbs, graminoid, hardwood, litter, mesic, nonnative species, presence, shrub, shrubs, succession, swamp, vine, vines

Japanese stiltgrass is mostly associated with forest edges, wetlands, and disturbed areas throughout its US distribution [15]. Shade, low elevation, and moist to mesic soils are important for successful Japanese stiltgrass invasion, with overstory type apparently less important in determining Japanese stiltgrass presence or absence [137] (see Site Characteristics).
In its native range, Japanese stiltgrass grows mostly in riparian and mesic areas, being common along shady riverbanks in broadleaved forests [220].
Japanese stiltgrass is often associated with several other nonnative species in the United States. It is frequently found with garlic mustard (Alliaria petiolata) in the East and Southeast ([127]; also see the Vegetation classifications list below). Japanese honeysuckle (Lonicera japonica) is often consistently associated with Japanese stiltgrass in the Great Lakes and eastern regions of the United States. In a southern Illinois oak-hickory forest, for example, Japanese stiltgrass cooccurred with Japanese honeysuckle and was also associated with nonnative sericea lespedeza (Lespedeza cuneata) and multiflora rose (Rosa multiflora) [68]. Japanese barberry (Berberis thunbergii) commonly cooccurs with Japanese stiltgrass across Japanese stiltgrass's distributional range [174]. In New Jersey, Japanese stiltgrass and Japanese barberry grew together in a bottomland oak-American beech-sweet birch (Quercus spp.-Fagus grandifolia-Betula lenta) forest [53]. Japanese stiltgrass is sometimes associated with Norway maple. In red maple forests of New Jersey, Japanese stiltgrass dominated the ground layer of sites where Norway maple had replaced red maple as the overstory dominant [129].
The following descriptions provide information on where Japanese stiltgrass is known to be present, invasive, or likely to be invasive based
upon current knowledge of Japanese stiltgrass's habitat preferences. Japanese stiltgrass is likely invasive or dominant in more plant communities than those described below
Great Lakes and Northeast:
Japanese stiltgrass occurs in pine (Pinus), oak (Quercus)-pine, oak-hickory (Carya), and mixed-hardwood woodlands and forests in these regions. In recently burned, mixed-mesophytic woodlands of southern Illinois, overstory codominants of Japanese stiltgrass-infested sites included river birch (Betula nigra), black walnut (Juglans nigra), sycamore (Platanus occidentalis), black cherry (Prunus serotina), and winged elm (Ulmus alata). Philadelphia fleabane (Erigeron philadelphicus), clammy groundcherry (Physalis heterophylla), fragrant bedstraw (Galium triflorum) and drooping woodreed (Cinna latifolia) cooccurred with Japanese stiltgrass in the ground layer [7]. Overstory codominants in a southern Illinois black oak-post oak (Q. velutina-Q. stellata) forest in early old-field succession included eastern redcedar (Juniperus virginiana), flowering dogwood (Cornus florida), sassafras (Sassafras albidum), and common persimmon (Diospyros virginiana). Coralberry (Symphoricarpos orbiculatus), poison-ivy (Toxicodendron radicans), and nonnative Japanese honeysuckle were commonly associated understory species. Herbs associated with Japanese stiltgrass in the ground layer included big bluestem (Andropogon gerardii), golden alexanders (Zizia aurea), and blunt-lobe woodsia (Woodsia obtusa) [68].
In New Jersey, Japanese stiltgrass occurred in red oak-black oak-chestnut-white oak (Q. rubra-Q. velutina-Q. prinus-Q. alba) and white ash-sweet birch-American beech (Fraxinus americana-Betula lenta-Fagus grandifolia) forests. It was less common on sites with high cover of overstory oaks and understory
blueberries (Vaccinium spp.) than in other hardwood forest types [100]. Overstory associates of Japanese stiltgrass in a sugar maple-red maple (Acer saccharum-A. rubrum)-sweet birch forest in New Jersey included shagbark hickory (C. ovata), bitternut hickory (C. cordiformis), and American elm
(U. americana). The most common shrubs included black haw (Viburnum prunifolium), spicebush (Lindera benzoin), and multiflora rose. Although Japanese stiltgrass was the most common groundlayer species, jack-in-the-pulpit (Arisaema vimineum) frequently cooccurred in the ground layer [210].
In Maryland, Japanese stiltgrass occurred in the ground layers of Virginia pine-southern red oak (Pinus virginiana-Q. falcata) communities. Yellow-poplar
(Liriodendron tulipifera), red maple, hickory (Carya spp.), and black cherry were associated in the overstory [27]. In Maryland and Virginia, Japanese
stiltgrass was a component of mixed oak-sweetgum-swamp tupelo (Quercus spp.-Liquidambar styraciflua-Nyssa
sylvatica var. biflora) communities on the inland coastal plain of Chesapeake Bay [170].
Appalachians:
Japanese stiltgrass is common in low-elevation oak-pine forests of the Piedmont [90,171,172]. In Cumberland County, Pennsylvania, Japanese stiltgrass occurred in a red maple/spicebush/skunk cabbage-sphagnum (Symplocarpus foetidus-Sphagum spp.) swamp [112]. Romagosa and Robinson [172] provide a comprehensive list of shrub, vine, and herbaceous associates of Japanese stiltgrass in an upland loblolly pine (P. taeda)-mixed
oak forest on piedmont sites in Pennsylvania. The federally endangered [208] glade spurge (Euphorbia purpurea) cooccurred with Japanese stiltgrass in the forest's groundlayer vegetation [112].
Japanese stiltgrass is reported in mixed-hardwood and riparian communities in Kentucky. In mixed-hardwood forest in the Cumberland Mountains, overstory species associated with Japanese stiltgrass included northern red oak (Q. rubra), white oak, yellow-poplar (Liriodendron tulipifera), Virginia pine, sugar maple (Acer saccharum), basswood (Tilia heterophylla), American beech, and yellow buckeye (Aesculus octandra). Common shrubs and vines were strawberry-bush (Euonymus americana), hillside blueberry (Vaccinium pallidum), Virginia creeper (Parthenocissus quinquefolia), and common greenbrier (Smilax rotundifolia). At 9% to 35% cover, Japanese stiltgrass was the most common graminoid. Associated grasses and forbs included mannagrass (Glyceria spp.), slender muhly (Muhlenbergia tenuiflora), white snakeroot (Ageratina altissima), and panicledleaf ticktrefoil (Desmodium paniculatum) [165]. Along the Blue River of Kentucky, Japanese stiltgrass occurred in a big bluestem-indiangrass (Sorghastrum nutans) prairie on gravel wash [81]; the federally endangered [208] Short's goldenrod (Solidago shortii) also occurred in the gravel-wash prairie community [81].
Southeast and South:
In the Southeast, Japanese stiltgrass often occurs upland from or in dry portions of wet grasslands [187]. On a North Carolina floodplain, Japanese stiltgrass and Japanese honeysuckle comprised nearly 100% of the ground layer and understory of a boxelder-green ash (Acer negundo-Fraxinus pennsylvanica)-sycamore forest [12].
On the George Washington Memorial Parkway in Virginia, Japanese stiltgrass occurred in the ground layer of old-growth oak-hickory forest. Dominant trees include white oak, scarlet oak (Q. coccinea), and chestnut oak, shagbark hickory, and mockernut hickory (C. tomentosa). Shrub associates included mountain-laurel
(Kalmia latifolia), pink azalea (Rhododendron periclymenoides), and black huckleberry (Gaylussacia baccata). Groundlayer
herbaceous associates were winter bent grass (Agrostis hyemalis), broomsedge bluestem (Andropogon virginicus), common velvet grass (Holcus
lanatus), and white clover (Trifolium repens). Lianas were common in the forest and included
trumpet-creeper (Campsis radicans), Oriental bittersweet (Celastrus orbiculatus), Japanese honeysuckle, and summer grape (Vitis aestivalis) [222].
Japanese stiltgrass dominates some deciduous forests of the South. In the Whitehall Experimental Forest, Georgia, Japanese stiltgrass formed a continuous lawn in the ground layer of a red maple-white oak-sycamore forest. The understory was depauperate [20]. In surveys across west-central Georgia, Japanese stiltgrass was detected in 15 of 18 watersheds. Japanese stiltgrass and nonnative species in general were more common in or near urban-rural interfaces, but Japanese stiltgrass was also common in rural locations. Cover of Japanese stiltgrass and Chinese privet (Ligustrum sinense) was negatively correlated with overall species richness and overstory reproduction (r= -0.18, P=0.003) for both variables) [113].
Vegetation classifications describing plant communities in which Japanese stiltgrass dominates the groundlayer are listed below alphabetically.
Arkansas

  • Japanese stiltgrass is a local dominant in low-lying areas of loblolly pine-sweetgum forests throughout National Forests of Arkansas [134]
Louisiana

  • local dominant in low-lying areas of loblolly pine-sweetgum forests on the Kisatchie National Forest [133]
North Carolina

  • local dominant in low-lying areas of American beech-white oak forests on the Croatan National Forest [136]

  • Guilford Courthouse National Military Park


    • Japanese stiltgrass dominates in depressions within successional loblolly pine-sweetgum/poison-ivy forest communities

    • sweetgum/spicebush/jack-in-the-pulpit/Japanese stiltgrass piedmont forest communities by small streams [224]

  • local dominant in low-lying areas of white oak-southern red oak interior forests on the Uwharrie National Forest [135]
Pennsylvania

  • Delaware Water Gap National Recreation Area


    • eastern redcedar/autumn-olive (Elaeagnus umbellata)/multiflora rose/garlic mustard-annual vernalgrass (Anthoxanthum
      odoratum)-Japanese stiltgrass forest
      alliance

    • local dominant in planted eastern white pine (P. strobus)/Japanese stiltgrass forest types

    • bitternut hickory/sugar maple/Japanese barberry-multiflora rose/white snakeroot (Ageratina altissima)-Japanese stiltgrass lowland forest alliance

    • sugar maple-American beech-sweet birch/eastern hemlock (Tsuga canadensis)/wild lily-of-the-valley-Pennsylvania sedge (Maianthemum
      canadense-Carex pensylvanica)-Japanese stiltgrass forest alliance

    • sugar maple-American basswood/sugar maple/American bladdernut (Staphylea trifolia)/Japanese barberry/Japanese stiltgrass forest alliance

    • sugar maple-white ash/sugar maple/Japanese barberry/garlic mustard-white grass (Leersia virginica)-Japanese stiltgrass floodplain forest alliance

    • red maple/spicebush/great bladder sedge (C. intumescens)-Japanese stiltgrass-jewelweed (Impatiens capensis) palustrine forest alliance

    • yellow-poplar-red maple/sugar maple/spicebush/Japanese barberry/Japanese stiltgrass forest alliance

    • sycamore/red maple/spicebush/Virginia wildrye (Elymus virginicus)-Japanese stiltgrass-garlic mustard floodplain forest alliance

    • local dominant in black walnut-white ash/multiflora rose bottomland forest alliance

    • local dominant in black cherry-yellow-poplar/autumn-olive/Japanese barberry/Japanese stiltgrass forest alliance

    • local dominant in black cherry-yellow-poplar/autumn-olive/Japanese barberry/Japanese stiltgrass riverine scour alliance

    • silky dogwood (Cornus amomum)-multiflora rose/arrowleaf tear-thumb-sedge (Polygonum sagittatum-Carex spp.)-Japanese stiltgrass
      wet meadow alliance

    • local dominant in calcareous-seep wetland alliances [155,156]

  • Eisenhower National Historic Site


    • successional Virginia pine/eastern redcedar/Japanese barberry-multiflora rose/annual vernalgrass-Japanese stiltgrass forest vegetation type

    • sycamore-boxelder-black walnut/silver maple (Acer saccharinum)/garlic mustard-spreading sedge (C. laxiculmis)-Japanese stiltgrass
      forest vegetation type [157]

  • eastern white pine/Japanese stiltgrass, Norway spruce (Picea abies)/Japanese stiltgrass, and ash (Fraxinus spp.)/Japanese stiltgrass
    plantation forests in Evansburg State Park. Nonnative Amur honeysuckle (Lonicera maackii) and Japanese honeysuckle often dominate the shrub layer [98].

  • Gettysburg National Military Park


    • successional Virginia pine/eastern redcedar/Japanese barberry-multiflora rose/annual vernalgrass-Japanese stiltgrass forest vegetation type

    • sycamore-boxelder-black walnut/silver maple/garlic mustard-spreading sedge-Japanese stiltgrass forest vegetation type [157]

  • Hopewell Furnace National Historic Site


    • dry white oak-black oak-yellow-poplar/flowering dogwood/Japanese stiltgrass forest alliance

    • successional black walnut-American elm/spicebush/Japanese stiltgrass forest alliance

    • yellow-poplar/red maple-white ash/spicebush/Japanese stiltgrass forest alliance

    • red maple-green ash/red maple/Japanese stiltgrass palustrine forest alliance [161]

  • Valley Forge National Historical Park:


    • dry chestnut oak-black oak/sweetgum/Japanese stiltgrass, silver maple/poison-ivy/Japanese stiltgrass floodplain forest type

    • yellow-poplar-black oak/red maple/ flowering dogwood/Japanese stiltgrass forest type

    • sycamore-boxelder/spicebush/Oriental bittersweet/Japanese stiltgrass riverine floodplain forest type

    • black cherry/yellow-poplar-red maple/box elder/Japanese stiltgrass-garlic mustard forest type [162]

Tennessee

  • red maple-white ash/Japanese stiltgrass seasonally flooded forest vegetation type of Great Smoky Mountains National Park [199]

  • boxelder/osage-orange (Maclura pomifera)/Chinese privet/Japanese stiltgrass riparian forest community type at Stones River National Battlefield [138]
Texas

  • often a dominant groundlayer species in low-lying loblolly pine-sweet gum "seminatural" (secondary) forests near Gulf Coast prairies and marshes of eastern Texas [132]
Virginia

  • red maple-eastern white pine/Canadian clearweed (Pilea pumila)/Japanese stiltgrass plant associations in headwater floodplains and red maple/Virginia creeper
    (Parthenocissus quinquefolia)/Japanese stiltgrass-arrowleaf tear-thumb plant associations in riparian depressions throughout the state [159]

  • Appomattox Court House National Historical Park

    • successional Virginia pine/Japanese honeysuckle/Japanese stiltgrass forest vegetation type

    • successional yellow-poplar/Japanese honeysuckle/Japanese stiltgrass forest vegetation type

    • yellow-poplar-red maple/American hornbeam (Carpinus caroliniana)/spicebush/Japanese stiltgrass forest vegetation type [148]


  • often a dominant groundlayer species in sycamore-sweetgum-yellow-poplar temporarily flooded forest alliances at Booker T. Washington National Monument [149]

  • Colonial National Historical Park


    • tree-of-heaven (Ailanthus altissima)-loblolly pine/Japanese stiltgrass forest alliance

    • loblolly pine-white oak-southern red oak/Japanese stiltgrass forest alliance; without Japanese stiltgrass, litter layer of this and other pine communities in the Park is typically sparse

    • disturbed calcareous forest alliances (oaks, pines, yellow-poplar are typical overstory dominants)

    • American beech-white oak-yellow-poplar/Japanese stiltgrass forest alliance

    • black walnut/wingstem (Verbesina alternifolia)-Japanese stiltgrass forest alliance

    • yellow-poplar-loblolly pine/Japanese stiltgrass forest alliance

    • sweetgum-yellow-poplar/Japanese stiltgrass forest alliance

    • coastal plain or piedmont small-stream floodplain forest alliances (sweetgum-red maple-yellow-poplar is typical of overstory)

    • red maple-sycamore/Japanese stiltgrass disturbed seep swamp alliances [150]

  • Fredericksburg and Spotsylvania National Military Park


    • dominant groundlayer species in successional eastern redcedar woodland alliance

    • dominant groundlayer species in silver maple-boxelder forest alliance

    • dominant groundlayer species in temporarily flooded sweetgum-yellow-poplar forest alliance [195]

  • sometimes a dominant groundlayer species in loblolly pine-sweetgum seminatural forest of George Washington Birthplace National Monument [151]

  • Petersburg National Battlefield


    • loblolly pine-sweetgum/Japanese stiltgrass seminatural forest type

    • willow oak-pine oak-swamp chestnut oak/common greenbrier (Smilax rotundifolia)/Japanese stiltgrass coastal floodplain and piedmont floodplain forest types

    • yellow-poplar-white oak-willow oak (Q. phellos)/Japanese honeysuckle/Japanese stiltgrass forest type

    • sweetgum-yellow-poplar/spicebush/Japanese stiltgrass forest type

    • locally dominant in low-lying areas of American beech-white oak/American holly (Ilex opaca) forest type [152]

  • Richmond National Battlefield Park

    • loblolly pine-sweetgum/Japanese stiltgrass seminatural forest type

    • successional yellow-poplar-oak/Japanese stiltgrass forest type

    • sweetgum-yellow-poplar/spicebush/Japanese stiltgrass floodplain forest type

    • locally dominant in American beech-white oak-northern red oak/American holly forest type

    • successional black walnut-sweetgum/hackberry (Celtis occidentalis)/Japanese stiltgrass forest type

    • black walnut/wingstem/Japanese stiltgrass forest type

    • locally dominant in hazelalder (Alnus serrulata) shrubland swamps [153]

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  • 174. Ross, Kristen A.; Ehrenfeld, Joan G. 2003. Effects of nitrogen supply on the dynamics and control of Japanese barberry (Berberis thunbergii) and Japanese stiltgrass (Microstegium vimineum). In: Invasive plants in natural and managed systems: linking science and management: Proceedings, 7th international conference on the ecology and management of alien plant invasions; 2003 November 3-7; Fort Lauderdale, FL. Lawrence, KS: Weed Science Society of America: 77. Abstract. [49848]
  • 187. Stocker, Randall; Hupp, Karen V. S. 2008. Fire and nonnative invasive plants in the Southeast bioregion. In: Zouhar, Kristin; Smith, Jane Kapler; Sutherland, Steve; Brooks, Matthew L., eds. Wildland fire in ecosystems: Fire and nonnative invasive plants. Gen. Tech. Rep. RMRS-GTR-42-vol. 6. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station: 91-112. [70903]
  • 195. Taverna, Kristin. 2008. Vegetation classification and mapping at Fredericksburg and Spotsylvania National Military Park. Technical Report NPS/NER/NRTR--2008/126. Philadelphia, PA: U.S. Department of the Interior, National Park Service, Northeast Region. 277 p. [79671]
  • 199. The Nature Conservancy. 1999. Vegetation classification of Great Smoky Mountains National Park (Cades Cove and Mount Le Conte quadrangles). Final report. National Vegetation Classification--Southeastern United States. Arlington, VA: The Nature Conservancy. 195 p. [79665]
  • 20. Bradford, Mark A.; DeVore, Jayna L.; Maerz, John C.; McHugh, Joseph V.; Smith, Cecil L.; Strickland, Michael S. 2010. Native, insect herbivore communities derive a significant proportion of their carbon from a widespread invader of forest understories. Biological Invasions. 12(4): 721-724. [80708]
  • 208. U.S. Department of the Interior, Fish and Wildlife Service, Division of Endangered Species. 2011. Threatened and endangered animals and plants, [Online]. Available: http://www.fws.gov/endangered/wildlife.html. [62042]
  • 210. Van Clef, Michael; Stiles, Edmund W. 2001. Seed longevity in three pairs of native and non-native congeners: assessing invasive potential. Northeastern Naturalist. 8(3): 301-310. [49782]
  • 220. Weber, Ewald. 2003. Invasive plant species of the world: a reference guide to environmental weeds. Cambridge, MA: CABI Publishing. 548 p. [71904]
  • 222. Wells, Elizabeth Fortson; Brown, Rebecca Louise. 2000. An annotated checklist of the vascular plants in the forest at historic Mount Vernon, Virginia: a legacy from the past. Castanea. 65(4): 242-257. [47363]
  • 224. White, Rickie D., Jr.; Pyne, Milo. 2003. Vascular plant inventory and plant community classification for Guilford Courthouse National Military Park. NatureServe Technical Report: Cooperative Agreement H 5028 01 0435. Durham, NC: NatureServe. 121 p. Available online: http://www.natureserve.org/library/guilfordreport.pdf [2011, February 18]. [79630]
  • 27. Carroll, J. F. 2003. Survival of larvae and nymphs of Ixodes scapularis Say (Acari: Ixodidae) in four habitats in Maryland. Proceedings, Entomological Society of Washington. 105(1): 120-126. [44657]
  • 53. Ehrenfeld, Joan G.; Kourtev, Peter; Huang, Weize. 2001. Changes in soil functions following invasions of exotic understory plants in deciduous forests. Ecological Applications. 11(5): 1287-1300. [44656]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]
  • 7. Anderson, Roger C.; Schwegman, John E.; Anderson, M. Rebecca. 2000. Micro-scale restoration: a 25-year history of a southern Illinois barrens. Restoration Ecology. 8(3): 296-306. [36810]
  • 81. Homoya, Michael A.; Abrell, D. Brian. 2005. A natural occurrence of the federally endangered Short's goldenrod (Solidago shortii T. & G.) [Asteraceae] in Indiana: its discovery, habitat, and associated flora. Castanea. 70(4): 255-262. [76232]
  • 90. Hunt, David M.; Zaremba, Robert E. 1992. The northeastward spread of Microstegium vimineum (Poaceae) into New York and adjacent states. Rhodora. 94(878): 167-170. [44638]
  • 98. Khan, Nancy R.; Block, Timothy A.; Rhoads, Ann F. 2008. Vascular flora and community assemblages of Evansburg State Park, Montgomery County, Pennsylvania. The Journal of the Torrey Botanical Society. 135(3): 438-458. [72478]

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Habitat in the United States

Stiltgrass occurs in a wide variety of habitats including moist ground of open woods, floodplain forests, wetlands, uplands, fields, thickets, paths, clearings, roadsides, ditches, utility corridors, and gardens. It readily invades areas subject to regular mowing, tilling, foot traffic, and other soil disturbing activities as well as natural disturbances such as the scouring associated with flooding. Stiltgrass appears to prefer moist, acidic to neutral soils that are high in nitrogen.

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U.S. National Park Service Weeds Gone Wild website

Source: U.S. National Park Service

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Habitat & Distribution

Forest margins, moist grassy places. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hebei, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Shaanxi, Shandong, Shanxi, Sichuan, Taiwan, Yunnan, Zhejiang [Bhutan, NE India, Japan, Korea, Myanmar, Nepal, Philippines, Russia, Vietnam; SW Asia (Iran); introduced in America and elsewhere].
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© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA

Source: Missouri Botanical Garden

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Roadsides, ditches, grasslands; 1500–2500 m.
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© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA

Source: Missouri Botanical Garden

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Associations

Faunal Associations

The presence of Japanese Stiltgrass is associated with increased populations of leafhoppers, seedbugs (Lygaeidae), grasshoppers, and crickets. These insects apparently feed on this grass to some extent. In addition, a greater abundance of predatory insects, damsel bugs (Nabidae), apparently feed upon some of the preceding insects. Such mammalian herbivores as deer, horses, and goats usually avoid this grass when there is better vegetation to browse. This may be related to the silica content of its foliage. There is some evidence that populations of the White-Footed Mouse increase when Japanese Stiltgrass becomes more abundant as a result of the protective cover that its clonal colonies provide. To some extent, the grains of this grass spread to new locations as a result of the agency of animals and humans. The grains, particularly when they are accompanied by awns, can stick to the fur of mammals, the feathers of birds, and the clothing of humans; and they can be spread by muddy feet and shoes. Heavy construction and road maintenance equipment may spread the grains along roadsides through muddy tires, or plants with seedheads may become snagged on the undercarriages of such vehicles.
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© John Hilty

Source: Illinois Wildflowers

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General Ecology

Fire Management Considerations

More info for the terms: cover, fire exclusion, fire suppression, fuel, litter, natural, prescribed fire, restoration

In general, diligent monitoring and early detection are critical for preventing establishment of large populations of invasive plants. Eradicating established Japanese stiltgrass plants and small patches adjacent to a burned area may prevent or limit seed dispersal into the burn [9,73,206].

Potential for postfire establishment and spread: Japanese stiltgrass's autecology suggests that it is likely to invade burns. It favors disturbed, open sites and mineral soil for establishment (see Regeneration Processes) and once present, tends to displace native vegetation (see Impacts). Postfire establishment is especially likely on burns subject to foot, motor vehicle, and other traffic that transports Japanese stiltgrass seeds onto the burn (see Seed dispersal). Romanello [173] reported that Japanese stiltgrass was most likely to establish from the soil seed bank if present before disturbance, suggesting postfire Japanese stiltgrass establishment can be expected where Japanese stiltgrass was present before fire. Based on reports to date (2010), groundlayer dominance of Japanese stiltgrass has been greatest in yellow-poplar-sweetgum communities; however, given Japanese stiltgrass invasion and spread in a wide range of forest and some shrubland and grassland types in the eastern and southern United States (see Habitat Types and Plant Communities), most low- to midelevation sites can be considered vulnerable to postfire Japanese stiltgrass invasion.

Preventing postfire establishment and spread: Preventing Japanese stiltgrass and other invasive plants from establishing in weed-free burned areas is the most effective and least costly management method. This may be accomplished through early detection and eradication, careful monitoring and follow-up, and limiting dispersal of invasive plant propagules into burned areas. General recommendations for preventing postfire establishment and spread of invasive plants include:

  • Incorporate cost of weed prevention and management into fire rehabilitation plans
  • Acquire restoration funding
  • Include weed prevention education in fire training
  • Minimize soil disturbance and vegetation removal during fire suppression and rehabilitation activities
  • Minimize the use of retardants that may alter soil nutrient availability, such as those containing nitrogen and phosphorus
  • Avoid areas dominated by high priority invasive plants when locating firelines, monitoring camps, staging areas, and helibases
  • Clean equipment and vehicles prior to entering burned areas
  • Regulate or prevent human and livestock entry into burned areas until desirable site vegetation has recovered sufficiently to resist invasion by undesirable vegetation
  • Monitor burned areas and areas of significant disturbance or traffic from management activity
  • Detect weeds early and eradicate before vegetative spread and/or seed dispersal
  • Eradicate small patches and contain or control large infestations within or adjacent to the burned area
  • Reestablish vegetation on bare ground as soon as possible
  • Avoid use of fertilizers in postfire rehabilitation and restoration
  • Use only certified weed-free seed mixes when revegetation is necessary
For more detailed information on these topics, see the following publications: [9,23,73,206].

Japanese stiltgrass may require postfire control on sites where thinning and prescribed fire promoted its germination and spread. The LaRue-Pine Hills Research Natural Area of southern Illinois is a remnant little bluestem-indiangrass prairie barren that was historically maintained by frequent fires. The fires, probably intentionally set by Native Americans [1,40,66,67,192], maintained the barren by pruning woody vegetation to a bushy, scrub form. Forest Service personnel intermittently managed the Research Natural Area with fire from 1969 to 1993. That period included 16 years of fire exclusion (1974-1989), during which woody vegetation began invading the barrens. Restoration thinnings of white oak, southern red oak, common persimmon, and other woody species began in 1988. Annual prescribed burning was resumed in 1990. Japanese stiltgrass was first noted on woodland study plots in 1992 but was not found on similarly treated barren or woodland-barren transition area plots. The authors suggest that Japanese stiltgrass "was likely favored by the disturbance associated with mechanical removal of woody species and the reintroduction of prescribed burning" in the woodland [6,7].

Use of prescribed fire as a control agent: To date (2010), the available literature provided no accounts of successful control of Japanese stiltgrass using prescribed fire; however, there may potential for using prescribed fire to control Japanese stiltgrass under some circumstances and in combination with other treatments. For example, burning might be used to help reduce litter and standing plant biomass prior to herbicide application for Japanese stiltgrass control [201], although there is some question about whether Japanese stiltgrass will carry fire when green (see Fuels). Early-season fire does not control Japanese stiltgrass (Barden 1991 as cited by [201]); burned plants may sprout and seedlings may establish from soil-stored seed and produce new seed by the end of the growing season. Fall fire, when Japanese stiltgrass is flowering but before seed set (see Seasonal Development), may help control Japanese stiltgrass [201].

In Big Oaks National Wildlife Refuge, Indiana, late summer prescribed fire, spring prescribed fire, hand-pulling, and fall mowing were compared as control treatments for Japanese stiltgrass. Study sites were in second-growth American beech-black walnut-Virginia pine/northern spicebush forest with a history of prescribed fire. Late summer fires were ignited and mowing was conducted in early September after Japanese stiltgrass had set seed. Spring fires were ignited and hand-pulling started in June, when Japanese stiltgrass seedlings were 4 to 8 inches (10-20 cm) tall. Compared to untreated control plots, fall fire and mowing caused significant reductions in Japanese stiltgrass cover and biomass. Compared to controls, fall fires reduced Japanese stiltgrass cover by 79% and biomass by 90%, while mowing reduced cover by 70% and biomass by 95%. Spring fire significantly reduced Japanese stiltgrass cover but not its biomass (P<0.05 for all variables). Hand-pulling in spring did not significantly change Japanese stiltgrass cover or biomass. Native understory species showed no significant difference in cover or biomass on treated compared to control plots [64].

Altered fuel characteristics: Japanese stiltgrass has the potential to increase litter, reduce woody debris, and alter stand structure where it is present. See Fuels and Impacts for further details.
  • 1. Abrams, Marc D. 1992. Fire and the development of oak forests. BioScience. 42(5): 346-353. [19215]
  • 173. Romanello, Genevieve Allen. 2009. Microstegium vimineum invasion in central Pennsylvanian slope, seep wetlands site comparisons, seed bank investigation and water as a vector for dispersal. University Park, PA: The Pennsylvania State University. 104 p. Thesis. [80653]
  • 192. Taft, John B. 1997. Savanna and open-woodland communities. In: Schwartz, Mark W., ed. Conservation in highly fragmented landscapes. New York: Chapman & Hall: 24-54. [51500]
  • 201. Tu, Mandy. 2000. Element stewardship abstract: Microstegium vimineum, [Online]. In: Managment library--plants. In: The global invasive species team (GIST). Arlington, VA: The Nature Conservancy (Producer). Available: http://www.invasive.org/gist/esadocs/documnts/micrvim.pdf [2011, January 21]. [51450]
  • 206. U.S. Department of Agriculture, Forest Service. 2001. Guide to noxious weed prevention practices. Washington, DC: U.S. Department of Agriculture, Forest Service. 25 p. Available online: http://www.fs.fed.us/invasivespecies/documents/FS_WeedBMP_2001.pdf [2009, November 19]. [37889]
  • 23. Brooks, Matthew L. 2008. Effects of fire suppression and postfire management activities on plant invasions. In: Zouhar, Kristin; Smith, Jane Kapler; Sutherland, Steve; Brooks, Matthew L., eds. Wildland fire in ecosystems: Fire and nonnative invasive plants. Gen. Tech. Rep. RMRS-GTR-42-vol. 6. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station: 269-280. [70909]
  • 40. Delcourt, Paul A.; Delcourt, Hazel R. 1998. The influence of prehistoric human-set fires on oak-chestnut forests in the southern Appalachians. Castanea. 63(3): 337-345. [30336]
  • 6. Anderson, Roger C.; Schwegman, John E. 1991. Twenty years of vegetational change on a southern Illinois barren. Natural Areas Journal. 11(2): 100-107. [16256]
  • 64. Flory, S. Luke; Lewis, Jason. 2009. Nonchemical methods for managing Japanese stiltgrass (Microstegium vimineum). Invasive Plant Science and Management. 2(4): 301-308. [80647]
  • 66. Fralish, James S.; Crooks, Fred B.; Chambers, Jim L.; Harty, Francis M. 1991. Comparison of presettlement, second-growth and old-growth forest on six site types in the Illinois Shawnee Hills. The American Midland Naturalist. 125(2): 294-309. [50865]
  • 67. Fralish, James S.; Franklin, Scott B.; Close, David D. 1999. Open woodland communities of southern Illinois, western Kentucky, and middle Tennessee. In: Anderson, Roger; Fralish, James S.; Baskin, Jerry M., eds. Savannas, barrens, and rock outcrop plant communities of North America. Boston, MA: Cambridge University Press: 171-189. [51448]
  • 7. Anderson, Roger C.; Schwegman, John E.; Anderson, M. Rebecca. 2000. Micro-scale restoration: a 25-year history of a southern Illinois barrens. Restoration Ecology. 8(3): 296-306. [36810]
  • 73. Goodwin, Kim; Sheley, Roger; Clark, Janet. 2002. Integrated noxious weed management after wildfires. EB-160. Bozeman, MT: Montana State University, Extension Service. 46 p. Available online: http://www.msuextension.org/store/Products/Integrated-Noxious-Weed-Management-After-Wildfires__EB0160.aspx [2011, January 20]. [45303]
  • 9. Asher, Jerry; Dewey, Steven; Olivarez, Jim; Johnson, Curt. 1998. Minimizing weed spread following wildland fires. In: Christianson, Kathy, ed. Western Society of Weed Science: Proceedings; 1998 March 10-12; Waikoloa, HI. In: Proceedings, Western Society of Weed Science. 51: 49. Abstract. [40409]

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Fire Regimes

More info for the terms: fire regime, fuel, litter, severity

Across Japanese stiltgrass's US distribution, FIRE REGIMES vary from frequent surface fires to long-interval, stand-replacement fires. In northeastern maple-birch-beech (Acer-Betula-Fagus spp.) forests, historic fire-return intervals were highly variable, depending upon microclimate, topography, and soil. Fires were mostly of mixed severity. Stand-replacing, medium-interval (~80-yr) fires were most common in forests dominated by birches, while long-interval (≥300 years), mixed-severity or stand-replacing fires occurred in forests dominated by maple and/or beech [57,65,77,177,216]. Oak-hickory, oak-pine, and pine forests of the Northeast and Southeast had mostly frequent understory surface fires [190,216]. See the Fire Regime Table for further information on FIRE REGIMES of vegetation communities in which Japanese stiltgrass may occur.

Japanese stiltgrass was not present in these forests while historic FIRE REGIMES were still operating, and it is unclear how Japanese stiltgrass may affect or alter fire regimes in plant communities where it is present. Japanese stiltgrass's tendency to invade disturbed forests (see Successional Status), its ability to produce abundant litter that decays slowly, and its potential to reduce establishment of woody species and form monocultures—thereby altering stand structure (see Impacts)—make it likely that Japanese stiltgrass alters fuel loads and fire behavior from historic patterns. Further fire studies on Japanese stiltgrass and observations of fire behavior where Japanese stiltgrass is present are needed.

  • 177. Runkle, James Reade. 1981. Gap regeneration in some old-growth forests of the eastern United States. Ecology. 62(4): 1041-1051. [75]
  • 190. Swain, Albert M. 1978. Environmental changes during the past 2000 years in north-central Wisconsin: analysis of pollen, charcoal, and seeds from varved lake sediments. Quaternary Research. 10(1): 55-68. [6968]
  • 216. Wade, Dale D.; Brock, Brent L.; Brose, Patrick H.; Grace, James B.; Hoch, Greg A.; Patterson, William A., III. 2000. Fire in eastern ecosystems. In: Brown, James K.; Smith, Jane Kapler, eds. Wildland fire in ecosystems: Effects of fire on flora. Gen. Tech. Rep. RMRS-GTR-42-vol. 2. Ogden, UT: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station: 53-96. [36983]
  • 57. Fahey, Timothy J.; Reiners, William A. 1981. Fire in the forests of Maine and New Hampshire. Bulletin of the Torrey Botanical Club. 108(3): 362-373. [9707]
  • 65. Forman, Richard T. T.; Boerner, Ralph E. 1981. Fire frequency and the Pine Barrens of New Jersey. Bulletin of the Torrey Botanical Club. 108(1): 34-50. [8645]
  • 77. Harmon, Mark E. 1984. Survival of trees after low-intensity surface fires in Great Smoky Mountains National Park. Ecology. 65(3): 796-802. [10997]

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Fuels

More info for the terms: cover, fuel, litter, nonnative species, surface fire

Live Japanese stiltgrass may be difficult to burn. Its low flammability and relative unpalatability suggest that it has high silica content, which could reduce its ability to carry fire when green [218].

As of 2010, measurements of Japanese stiltgrass fuel loads in northeastern or southeastern forests were not available in the literature. Japanese stiltgrass's ability to exclude woody species and form thick ground cover suggest that it may increase fine fuels and reduce woody debris from historical levels. However, Kourtev and others [100] reported that in New Jersey, sites invaded by Japanese stiltgrass had thinner litter and organic soil layers than sites without Japanese stiltgrass, which they attributed to high densities of nonnative earthworms on sites with Japanese stiltgrass (see Soil and soil microfauna changes for more information). Similarly, in white oak forests of New York, Japanese stiltgrass-invaded sites had thinner organic soil horizons than adjacent uninvaded sites [51]. Japanese stiltgrass litter tends to decay slowly, which may increase fine fuels compared to sites with litter of faster-decaying native species.

As an annual, mat-forming grass, Japanese stiltgrass often produces large amounts of fine litter that may remain on the forest floor longer than litter of some native plant species. Japanese stiltgrass stems lodge soon after they die in autumn [12,27]. When thick, they create a continuous fuelbed of matted straw that could potentially fuel a surface fire [12]. Japanese stiltgrass litter apparently decays more slowly than litter of some associated species [41]. In a New Jersey study, Japanese stiltgrass litter decayed more slowly than litter of native hillside blueberry [53]. In a North Carolina field experiment, litter of nonnative Oriental lady's-thumb (Polygonum caespitosum) was about 30% decayed after 120 days, while Japanese stiltgrass was only about 5% decayed [41,43]. However, in a landscape-level study of 3 white oak-sweet birch forests in New Jersey, sites with Japanese stiltgrass had less litter than adjacent uninvaded sites. Over 2 years, the on-site decay rate of white oak litter was slower (30% mass loss) than decay rates for Japanese stiltgrass litter (40%-50%) [51].

Dibble and others [45] reported that standing dead and down litter of Japanese stiltgrass and other nonnative invasive grasses may present a fuel hazard in drought years. Flammability of live Japanese stiltgrass, however, may be low. In the laboratory, Japanese stiltgrass's heat of combustion was among the lowest of 42 native and nonnative species in the Northeast [46]. A management guide for the southern United States reports that Japanese stiltgrass is not a fire hazard [56].

In mixed-hardwood and oak-hickory forests of West Virginia, interior forest plots with Japanese stiltgrass had significantly lower coarse woody debris cover than plots without Japanese stiltgrass (P<0.003) [87].

  • 100. Kourtev, P. S.; Ehrenfeld, J. G.; Huang, W. Z. 1998. Effects of exotic plant species on soil properties in hardwood forests of New Jersey. Water, Air, and Soil Pollution. 105(1/2): 493-501. [44650]
  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 218. Warren, Robert J., II; Wright, Justin P.; Bradford, Mark A. 2011. The putative niche requirements and landscape dynamics of Microstegium vimineum: an invasive Asian grass. Biological Invasions. 13(2): 471-483. [80733]
  • 27. Carroll, J. F. 2003. Survival of larvae and nymphs of Ixodes scapularis Say (Acari: Ixodidae) in four habitats in Maryland. Proceedings, Entomological Society of Washington. 105(1): 120-126. [44657]
  • 41. DeMeester, Julie E.; Richter, Daniel deB. 2010. Differences in wetland nitrogen cycling between the invasive grass Microstegium vimineum and a diverse plant community. Ecological Applications. 20(3): 609-619. [80714]
  • 43. DeMeester, Julie Elizabeth. 2009. Feedbacks of nitrogen cycling and invasion with the non-native plant, Microstegium vimineum, in riparian wetlands. Durham, NC: Duke University. 136 p. Dissertation. [80518]
  • 45. Dibble, Alison C.; Rees, Catherine A. 2005. Does the lack of reference ecosystems limit our science? A case study in nonnative invasive plants as forest fuels. Journal of Forestry. 103(7): 329-338. [62256]
  • 46. Dibble, Alison C.; White, Robert H.; Lebow, Patricia K. 2007. Combustion characteristics of north-eastern USA vegetation tested in the cone calorimeter: invasive versus non-invasive plants. International Journal of Wildland Fire. 16(4): 426-443. [68947]
  • 51. Ehrenfeld, Joan G. 2003. Soil properties and exotic plant invasions: a two-way street. In: Fosbroke, Sandra L. C.; Gottschalk, Kurt W., eds. Proceedings: U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species: 13th annual meeting; 2002 January 15-18; Annapolis, MD. Gen. Tech. Rep. NE-300. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 18-19. [44156]
  • 53. Ehrenfeld, Joan G.; Kourtev, Peter; Huang, Weize. 2001. Changes in soil functions following invasions of exotic understory plants in deciduous forests. Ecological Applications. 11(5): 1287-1300. [44656]
  • 56. Evans, C. W.; Moorhead, D. J.; Bargeron, C. T.; Douce, G. K. 2006. Invasive plant responses to silvicultural practices in the South. Bugwood Network BW-2006-03. Tifton, GA: The University of Georgia Bugwood Network. 52 p. Available online: http://www.invasive.org/silvicsforinvasives.pdf [2010, December 2]. [72425]
  • 87. Huebner, Cynthia D. 2010. Establishment of an invasive grass in closed-canopy deciduous forests across local and regional environmental gradients. Biological Invasions. 12(7): 2069-2080. [80739]

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Fire adaptations and plant response to fire

More info for the terms: cohort, cover, litter, natural, prescribed fire, surface fire, top-kill, xeric

Fire adaptations: As an annual, Japanese stiltgrass likely relies mostly on postfire establishment from either on-site, soil-banked seed or off-site, transported seed. As of 2010, there were limited studies [6,7,69] and anecdotal accounts [12,68,189] of postfire Japanese stiltgrass establishment; however, details were few. Japanese stiltgrass may establish from seed on mineral soil after fire [56]. It spread after either litter removal down to mineral soil or litter removal and mineral soil disturbance in Tennessee [119]. In at least one account, Japanese stiltgrass likely established from soil-stored seed following a "hot" surface fire [12] (see Plant response to fire). Given its ability to store seed in the soil seed bank, effectively disperse seed, and establish on open, disturbed sites (see Successional Status), Japanese stiltgrass is likely to persist or invade after fire.

Plant response to fire: Details of Japanese stiltgrass postfire establishment were lacking in available literature (2010). Because it is an annual, this grass must establish from soil-stored seed and/or off-site seed transported onto burned sites after late-season fire ([7,12,68], review by [123]). A review by Tu [201] suggests that following early-season fire, top-killed Japanese stiltgrass may sprout and set seed later in the year (see Seasonal Development). According to a management guide for the southern United States [56] and Tu [201], Japanese stiltgrass that has not yet flowered may sprout from tillers and stolons following top-kill by fire [201]. A second crop of seedlings may establish after spring fire [12]. A review indicated that exposed mineral soils, such as those occurring after fire, provide a favorable seedbed for Japanese stiltgrass germination and establishment [220].

Japanese stiltgrass benefits from disturbances that open the canopy (see Successional Status); this likely includes fire [68]. A few studies demonstrate Japanese stiltgrass's ability to establish in postfire environments.

In oak-hickory and sugar maple-sweetgum-yellow-poplar communities of the Vinton Furnace Experimental Forest, Ohio, either mechanical litter removal or prescribed fires (both low and moderate severity) increased Japanese stiltgrass seedling establishment and growth compared to control plots (P<0.05 for all variables) [69]. Burned plots were sown with Japanese stiltgrass seeds in postfire year 1; litter-disturbed plots were also sown at that time. Japanese stiltgrass was removed prior to seed set to prevent invasion beyond study plots. In postfire year 2, seeds were sown in different burned plots that had previously been sown with multiflora rose but not Japanese stiltgrass. On burned plots, Japanese stiltgrass stem height and leaf number were greatest in canopy gaps on moderate-severity plots (P<0.05). August surveys revealed year and site interactions in Japanese stiltgrass's response to prescribed fire. In postfire year 1, Japanese stiltgrass seedling establishment was greatest on burned or litter-removed plots (P<0.0001). In postfire year 2, seedling establishment was greater in valley plots, where sugar maple tended to dominate, than on ridges, where oaks tended to dominate (P<0.01) [69]. The authors concluded that prescribed fire created a disturbance suitable to Japanese stiltgrass invasion ([69], abstract by Glasgow and Matlack [70]), and litter removal was the mechanism by which fire enhanced Japanese stiltgrass seedling recruitment [69]. See the Research Project Summary of this study for details on the fire prescription, fire behavior, and postfire responses of Japanese stiltgrass and multiflora rose.

Japanese stiltgrass invaded a remnant prairie after thinning and prescribed burning on the LaRue-Pine Hills Research Natural Area, Illinois [6,7]. See Preventing postfire establishment and spread for details.

There are several anecdotal accounts of postfire Japanese stiltgrass recruitment. In a boxelder-white ash-sycamore floodplain community in North Carolina, a 9 April 1982 prescribed fire entered a dense upland stand of Japanese stiltgrass seedlings. The previous year's cohorts had left a dense mat of Japanese stiltgrass litter that fueled "a hot ground fire" that killed the seedlings. By mid-June, a second cohort of Japanese stiltgrass had established, presumably from soil-stored seed, and provided dense ground cover [12]. Gibson and others [68] reported "increased recruitment" of Japanese stiltgrass following prescribed fire in a xeric, early-successional oak-hickory woodland that established on old fields abandoned in the 1960s (Shimp personal communication cited in [68]). In black oak-blackjack oak-post oak forests of northern Mississippi and western Tennessee, Surrette [189] found that Japanese stiltgrass was more abundant on spring-burned (March-April) plots compared to unburned plots. The author speculated that Japanese stiltgrass cover increased because the prescribed burning immediately preceded the time of Japanese stiltgrass germination [189].

  • 119. Marshall, Jordan Michael. 2007. Establishment, growth, spread, and ecological impacts of Microstegium vimineum in Central Hardwood forests. Knoxville, TN: The University of Tennessee. 149 p. Dissertation. [80649]
  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 123. Mehrhoff, L. J.; Silander, J. A., Jr.; Leicht, S. A.; Mosher, E. S.; Tabak, N. M. 2003. IPANE: Invasive Plant Atlas of New England, [Online]. Storrs, CT: University of Connecticut, Department of Ecology and Evolutionary Biology (Producer). Available: http://nbii-nin.ciesin.columbia.edu/ipane/ [2010, September 27]. [70356]
  • 189. Surrette, Sherry Bell. 2006. Environmental conditions promoting plant diversity in some upland hardwood and hardwood-pine forests of the interior coastal plain ecoregion. University, MS: The University of Mississippi. 137 p. Dissertation. [72015]
  • 201. Tu, Mandy. 2000. Element stewardship abstract: Microstegium vimineum, [Online]. In: Managment library--plants. In: The global invasive species team (GIST). Arlington, VA: The Nature Conservancy (Producer). Available: http://www.invasive.org/gist/esadocs/documnts/micrvim.pdf [2011, January 21]. [51450]
  • 220. Weber, Ewald. 2003. Invasive plant species of the world: a reference guide to environmental weeds. Cambridge, MA: CABI Publishing. 548 p. [71904]
  • 56. Evans, C. W.; Moorhead, D. J.; Bargeron, C. T.; Douce, G. K. 2006. Invasive plant responses to silvicultural practices in the South. Bugwood Network BW-2006-03. Tifton, GA: The University of Georgia Bugwood Network. 52 p. Available online: http://www.invasive.org/silvicsforinvasives.pdf [2010, December 2]. [72425]
  • 6. Anderson, Roger C.; Schwegman, John E. 1991. Twenty years of vegetational change on a southern Illinois barren. Natural Areas Journal. 11(2): 100-107. [16256]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]
  • 69. Glasgow, Lance S.; Matlack, Glenn R. 2007. The effects of prescribed burning and canopy openness on establishment of two non-native plant species in a deciduous forest, southeast Ohio, USA. Forest Ecology and Management. 238(1-3): 319-329. [66854]
  • 7. Anderson, Roger C.; Schwegman, John E.; Anderson, M. Rebecca. 2000. Micro-scale restoration: a 25-year history of a southern Illinois barrens. Restoration Ecology. 8(3): 296-306. [36810]
  • 70. Glasgow, Lance; Matlack, Glenn. 2006. Effects of prescribed burning on invasibility by nonnative plant species in the Central Hardwoods region. In: Dickinson, Matthew B., ed. Fire in eastern oak forests: delivering science to land managers: Proceedings of a conference; 2005 November 15-17; Columbus, OH. Gen. Tech. Rep. NRS-P-1. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 277. Abstract. [66419]

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Post-fire Regeneration

More info for the terms: caudex, ground residual colonizer, initial off-site colonizer, root crown, secondary colonizer

POSTFIRE REGENERATION STRATEGY
[186]:
Caudex or an herbaceous root crown, growing points in soil
Stolons in organic soil or on soil surface
Ground residual colonizer (on site, initial community)
Initial off-site colonizer (off site, initial community)
Secondary colonizer (on- or off-site seed sources)
  • 186. Stickney, Peter F. 1989. Seral origin of species comprising secondary plant succession in Northern Rocky Mountain forests. FEIS workshop: Postfire regeneration. Unpublished draft on file at: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory, Missoula, MT. 10 p. [20090]

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Immediate Effect of Fire

More info for the term: top-kill

As of this writing (2010) there were few accounts in the literature regarding the effects of fire on Japanese stiltgrass, and available information was mostly anecdotal. As an annual, Japanese stiltgrass is likely killed by late-season fires [12], although spring [56,201] and summer [201] fire may only top-kill Japanese stiltgrass. Accounts of postfire establishment provided by Barden [12] and Shimp (personal communication cited in [68]) suggest that Japanese stiltgrass seeds in the soil seed bank are likely to survive fire. However, information on the fire ecology of Japanese stiltgrass is limited, and research is needed to clarify fire effects on Japanese stiltgrass.
  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 201. Tu, Mandy. 2000. Element stewardship abstract: Microstegium vimineum, [Online]. In: Managment library--plants. In: The global invasive species team (GIST). Arlington, VA: The Nature Conservancy (Producer). Available: http://www.invasive.org/gist/esadocs/documnts/micrvim.pdf [2011, January 21]. [51450]
  • 56. Evans, C. W.; Moorhead, D. J.; Bargeron, C. T.; Douce, G. K. 2006. Invasive plant responses to silvicultural practices in the South. Bugwood Network BW-2006-03. Tifton, GA: The University of Georgia Bugwood Network. 52 p. Available online: http://www.invasive.org/silvicsforinvasives.pdf [2010, December 2]. [72425]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]

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Successional Status

More info on this topic.

More info for the terms: cover, frequency, hardwood, importance value, invasive species, litter, nonnative species, presence, succession, tree

Japanese stiltgrass is a shade-tolerant grass that may occupy all stages of forest succession (review by [123]).

Little English-language literature on succession in plant communities where Japanese stiltgrass is native was available as of 2010. In Japan, Japanese stiltgrass and other annual grasses typically dominate warm-temperate Chino bamboo (Pleioblastus chino) grasslands that are in early succession [139].

The following discussion applies only to plant communities in the eastern and southeastern United States.

Early succession: Japanese stiltgrass generally obtains greatest cover on open, seral sites or in canopy gaps [56,173] (see Late succession for information on canopy gaps). Open, early-seral sites in which it has established include old fields [7,68], active floodplains [12], minespoils [165], hurricane-disturbed sites [196], plantations [144], thinned [7] or clearcut [12] forests, burned woodlands and forests ([7,12], Shimp 2002 personal communication in [68]), and especially, forest edges [28,169]. In Great Smoky Mountains National Park, for example, Japanese stiltgrass was most invasive on forest edges [5]. On abandoned surface coal mines in Kentucky, Japanese stiltgrass was the most important understory herb in early succession of a mixed-hardwood, mesophytic forest, forming 9% to 35% cover. It formed thick swards in open areas [165]. In mixed-hardwood and oak-hickory forests of West Virginia, Japanese stiltgrass presence was associated with several indicators of early forest succession, including open canopies (P<0.001), high moss (Bryopsida) cover (P<0.001)), shallow litter (P=0.15) cover, and low levels of coarse woody debris (P=0.003) [87]. In the Oak Ridge National Environmental Research Park, Tennessee, Japanese stiltgrass seedling survivorship averaged 100% in full sunlight; 90% in 40% sunlight; 30% in 16% sunlight; and 5% in 6% sunlight. Biomass gain over the May to October growing season was significantly greater at 100% sunlight than at lower light levels (P<0.001). The forest overstory was dominated by sycamore, boxelder, and black walnut [36].

Dry climate may favor Japanese stiltgrass invasion on old fields of the eastern Unites States. On old fields in the Hutcheson Memorial Forest, New Jersey, Japanese stiltgrass cover increased after a severe drought in 1999, when April and May rainfall was less than half of normal. Across plots, Japanese stiltgrass increased in total cover from a predrought level of 0.01% in 1997 to a postdrought level of 646.6% in 2001. During that time, Japanese stiltgrass increases in cover and frequency were greater than those of any other species in the old fields [232]. Since then, Japanese stiltgrass has become the dominant groundlayer species in Hutcheson Memorial Forest (Yurkonis 2006 personal observation cited in [232]).

Disturbance ecology: Japanese stiltgrass readily establishes following disturbances such as flooding, mowing, and tilling. Within 3 to 5 years, it may form monotypic stands that crowd out native vegetation [191,215]. A survey (based on herbaria collections and remote-sensing data) of weed invasion patterns in West Virginia showed that Japanese stiltgrass was most common in roadside and streamside vegetation [84].

Japanese stiltgrass can recover rapidly—and may increase—after flooding (but see Gibson and others [68]). The input of silt and nutrients that accompanies short-term flooding can promote Japanese stiltgrass growth. For example, a study was initiated in 1982 on the Big Cross Creek floodplain of North Carolina. Big Cross Creek flooded in 1983, temporarily reducing Japanese stiltgrass cover, but Japanese stiltgrass exceeded preflood cover within 2 years [12].

Japanese stiltgrass cover before and after flooding in North Carolina [12]
1982 (preflood) 1983 (postflood) 1985 (postflood)
48% 23% 55%

By studying a boxelder-white ash-sycamore floodplain community in North Carolina, Barden [12] concluded that a history of disturbance was likely to improve Japanese stiltgrass's ability to invade a site. A relatively deep litter layer, greater LAI of other ground-dwelling species compared to Japanese stiltgrass, and high levels of sunlight reduced reproductive success of Japanese stiltgrass. He found that soil fertility was relatively unimportant in determining invasive ability of Japanese stiltgrass. Japanese stiltgrass failed to regenerate on undisturbed, fertile plots (high levels of soil nitrogen, potassium, calcium, and zinc). It showed greater biomass gain on plots treated with fertilizer compared to unfertilized control plots, but seed spikelet production was similar on fertilized vs. unfertilized plots [12].

It is unclear how vulnerable undisturbed sites are to Japanese stiltgrass invasion, and what factors, if any, contribute to a site's invasibility. Anecdotal evidence suggests that Japanese stiltgrass may not invade, or is slow to invade, undisturbed sites. However, long-term studies are needed to document Japanese stiltgrass's rate of colonization and expansion onto disturbed sites. A fact sheet suggests that Japanese stiltgrass may slowly spread onto undisturbed lands unless control measures are taken [201]. Japanese stiltgrass was absent from unmowed land next to a sewer line right-of-way in North Carolina, but invaded annually mowed land near the right-of-way [12]. An inventory of Land Between the Lakes National Recreation Area, Kentucky and Tennessee, showed Japanese stiltgrass occurred both within and adjacent to the Recreation Area boundaries. It was more common on adjacent private lands than inside the Recreation Area, which has been protected from mining, logging, and grazing since 1963. The authors cautioned, however, that periodic flooding left the Recreation Area vulnerable to Japanese stiltgrass seed dispersal and invasion [115]. A review suggests that Japanese stiltgrass can spread rapidly onto undisturbed sites from adjacent disturbed sites where it is well established [215]. In a New Jersey survey, Japanese stiltgrass and garlic mustard were the only 2 nonnative species that invaded undisturbed chestnut oak-red oak-pitch pine stands [16].

Midsuccession: Japanese stiltgrass is common in midsuccessional forests. In the Green Ridge State Forest, Maryland, Japanese stiltgrass presence was positively associated (P<0.05) with moderate (26-50%) canopy openings [130]. In Great Smoky Mountains National Park, mean height of Japanese stiltgrass stands peaked at 30% to 40% sunlight and decreased slightly after that. However, biomass of individual Japanese stiltgrass plants increased linearly with percent sunlight (P<0.001) [225]. In Maryland, Japanese stiltgrass infestations were common on shaded roadsides but not open roadsides [169].

Late succession: Japanese stiltgrass is shade tolerant [45,56,83] and can persist in late-successional forests as the canopies close [5,83,169,181]). In mixed-hardwood communities in the Blue Ridge Mountains of North Carolina, Japanese stiltgrass presence was positively correlated with forest cover (P<0.05) [104]. Japanese stiltgrass may form patches or dense, continuous lawns in late-successional forests [51]. An invasive species guide reports Japanese stiltgrass can persist in <5% sunlight [219]. Cheplick [28] reported Japanese stiltgrass on edges and under completely closed canopies of sweetgum-sycamore and loblolly pine-white oak-sweetgum forests of Mississippi, and Japanese stiltgrass was an understory component in old-growth sweetgum-overcup oak (Quercus lyrata)-river birch bottomland forests of Tennessee [182].

In late succession, Japanese stiltgrass usually occurs in canopy gaps. In a bottomland box elder-yellow-poplar-sycamore forest in Indiana, Japanese stiltgrass was positively correlated with light availability (r²=0.49, P=0.04) [61]. Hemlock wooly adelgid infestations [54,55] or other canopy-opening events may provide favorable open sites for Japanese stiltgrass invasion. In eastern hemlock forests with high mortality from hemlock wooly adelgids in Connecticut, several nonnative species showed high cover including Japanese stiltgrass, Oriental bittersweet, Japanese barberry, and tree-of-heaven [142]. In mixed-hardwood forests of North Carolina, vegetation frequency was surveyed on 107 permanent plots established in 1977 and resurveyed in 2000. Japanese stiltgrass had the second-highest increase in overall frequency during those 23 years; native American pokeweed (Phytolacca americana) increased most in frequency. Japanese stiltgrass was particularly abundant in open forest patches created by Hurricane Fran [196]. Based on field experiments, Cheplick [30] reported that Japanese stiltgrass may persist or spread in late-successional hardwood communities where sunflecks reach photosynthetic Japanese stiltgrass tissue.

Apparently, Japanese stiltgrass does not typically invade closed-canopy forests lacking canopy gaps [181]. Field experiments in Kentucky showed Japanese stiltgrass was unable to establish under the subcanopy, which consisted of juvenile red maple and spicebush. The oak-hickory forest was in late succession, and PAR was 1% to 2.5% of full sunlight beneath red maple and spicebush (abstract by [37]).

Japanese stiltgrass may alter successional pathways of forests in mid- to late succession. It grows quickly; Japanese stiltgrass is soon taller than the seedlings of most associated woody species and likely outcompetes young, native woody species and herbs for light [5]. In an oak-beech-maple forest of Lilly-Dickey Woods, Indiana, Japanese stiltgrass gained significantly more aboveground biomass than the native grass deertongue (Dichanthelium clandestinum) in fully shaded sites, while deertongue gained more biomass than Japanese stiltgrass in full sunlight (P<0.001). Biomass of the 2 grasses was similar in partial shade [60]. Japanese stiltgrass may establish in gaps that were historically colonized by oaks, hickories, ashes, and other early-seral tree species [154]. Aronson [8] speculated that in young-secondary oak forests, environmental changes associated with Japanese stiltgrass invasion, such as increased soil pH and soil nitrogen, may facilitate invasion of other nonnatives. On the Hutcheson Memorial Forest, New Jersey, Japanese stiltgrass was negatively correlated with cover of other nonnative species in young-secondary white oak-black oak-red oak forests. However, in mature-secondary and old-growth white oak-black oak-red oak forests, Japanese stiltgrass presence was positively correlated with cover of other nonnative species (P<0.05 for all variables). Young-secondary, mature-secondary, and old-growth forests were 50, 150, and ~300 years old, respectively. Overall, Japanese stiltgrass and garlic mustard were the dominant groundcover species at Hutcheson Memorial Forest. From 1950 to 1979, importance value of Japanese stiltgrass was 0, but it jumped to 32 by 2003 [8]. See the Impacts section for more information on other examples of Japanese stiltgrass's potential to alter forest succession.

White-tailed deer and Japanese stiltgrass may synergistically alter successional pathways in eastern deciduous forests with dense white-tailed deer populations [10]. See Impacts for more information on this relationship.
  • 10. Baiser, Benjamin; Lockwood, Julie L.; La Puma, David; Aronson, Myla F. J. 2008. A perfect storm: two ecosystem engineers interact to degrade deciduous forests of New Jersey. Biological Invasions. 10: 785-795. [73302]
  • 104. Kuhman, Timothy R.; Pearson, Scott M.; Turner, Monica G. 2010. Effects of land-use history and the contemporary landscape on non-native plant invasion at local and regional scales in the forest-dominated southern Appalachians. Landscape Ecology. 25(9): 1433-1445. [80577]
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  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 123. Mehrhoff, L. J.; Silander, J. A., Jr.; Leicht, S. A.; Mosher, E. S.; Tabak, N. M. 2003. IPANE: Invasive Plant Atlas of New England, [Online]. Storrs, CT: University of Connecticut, Department of Ecology and Evolutionary Biology (Producer). Available: http://nbii-nin.ciesin.columbia.edu/ipane/ [2010, September 27]. [70356]
  • 130. Mortensen, David A.; Rauchert, Emily S. J.; Nord, Andre N.; Jones, Brian P. 2009. Forest roads facilitate the spread of invasive plants. Invasive Plant Science and Management. 2(3): 191-199. [76168]
  • 139. Numata, Makoto. 1969. Progressive and retrogressive gradient of grassland vegetation measured by degree of succession--Ecological judgment of grassland condition and trend: IV. Vegtatio. 19(1/6): 96-127. [77129]
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  • 144. Oswalt, Christopher M.; Clatterbuck, Wayne K.; Oswalt, Sonja N.; Houston, Allan E.; Schlarbaum, Scott E. 2004. First-year effects of Microstegium vimineum and early growing season herbivory on planted high-quality oak (Quercus spp.) seedlings in Tennessee. In: Yaussy, Daniel; Hix, David M.; Goebel, P. Charles; Long, Robert P., eds. Proceedings, 14th central hardwood forest conference; 2004 March 16-19; Wooster, OH. Gen. Tech. Rep. NE-316. Newton Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 1-9. [CD]. [49689]
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  • 173. Romanello, Genevieve Allen. 2009. Microstegium vimineum invasion in central Pennsylvanian slope, seep wetlands site comparisons, seed bank investigation and water as a vector for dispersal. University Park, PA: The Pennsylvania State University. 104 p. Thesis. [80653]
  • 181. Shaw, Rebekha Jean Archibald. 2009. Shrinking the Janzen-Connell doughnut: consequences of an invasive multiplier (Microstegium vimineum) on the mid-canopy in a mixed pine-oak forest. Richmond, VA: Virginia Commonwealth University. 44 p. Thesis. [80656]
  • 182. Shear, Ted; Young, Mike; Kellison, Robert. 1997. An old-growth definition for red river bottom forests in the eastern United States. Gen. Tech. Rep. SRS-10. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 9 p. [28007]
  • 191. Swearingen, Jil M. 2004. Fact sheet: Japanese stilt grass--Microstegium vimineum (Trin.) Camus, [Online]. In: Weeds gone wild: Alien plant invaders of natural areas. Plant Conservation Alliance's Alien Plant Working Group (Producer). Available: http://www.nps.gov/plants/alien/fact/mivi1.htm [2004, December 10]. [51461]
  • 196. Taverna, Kristin; Peet, Robert K.; Phillips, Laura C. 2005. Long-term change in ground-layer vegetation of deciduous forests of the North Carolina Piedmont, USA. Journal of Ecology. 93: 202-213. [51495]
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  • 51. Ehrenfeld, Joan G. 2003. Soil properties and exotic plant invasions: a two-way street. In: Fosbroke, Sandra L. C.; Gottschalk, Kurt W., eds. Proceedings: U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species: 13th annual meeting; 2002 January 15-18; Annapolis, MD. Gen. Tech. Rep. NE-300. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 18-19. [44156]
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  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]
  • 7. Anderson, Roger C.; Schwegman, John E.; Anderson, M. Rebecca. 2000. Micro-scale restoration: a 25-year history of a southern Illinois barrens. Restoration Ecology. 8(3): 296-306. [36810]
  • 8. Aronson, Myla Faye. 2007. Ecological change by alien plants in an urban landscape. New Brunswick, NJ: The State University of New Jersey. 129 p. Dissertation. [80532]
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Vegetative regeneration

Within a growing season, Japanese stiltgrass increases vegetatively by tillering [30,90] and by stolons [90], sometimes forming dense, monospecific stands through vegetative spread [15]. Because Japanese stiltgrass is an annual, the vegetative shoots do not survive through the next growing season [68]. High vegetative biomass does, however, increase the likelihood of reproductive success by increasing photosynthate gain and thus the potential for high seed production. High light and other favorable conditions maximize vegetative growth [29].
  • 15. Barkworth, Mary E.; Capels, Kathleen M.; Long, Sandy; Piep, Michael B., eds. 2003. Flora of North America north of Mexico. Volume 25: Magnoliophyta: Commelinidae (in part): Poaceae, part 2. New York: Oxford University Press. 814 p. [68091]
  • 29. Cheplick, Gregory P. 2007. Plasticity of chamogamous and cleitogamous reproductive allocation in grasses. In: Columbus, J. Travis; Friar, Elizabeth A.; Porter, J. Mark; Prince, Linda M.; Simpson, Michael G., eds. Monocots: Comparative biology and evolution-- Poales. In: Aliso. Claremont, CA: Rancho Santa Ana Botanic Garden; 23: 286-294. [51460]
  • 30. Cheplick, Gregory P. 2010. Limits to local spatial spread in a highly invasive annual grass (Microstegium vimineum). Biological Invasions. 12(6): 1759-1771. [80612]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]
  • 90. Hunt, David M.; Zaremba, Robert E. 1992. The northeastward spread of Microstegium vimineum (Poaceae) into New York and adjacent states. Rhodora. 94(878): 167-170. [44638]

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Seedling establishment and plant growth

More info for the terms: cover, density, hardwood, leaf area index (LAI), litter, shrub

Japanese stiltgrass may initially establish in large numbers, experience high seedling mortality, then form thick lawns via vegetative expansion of remaining plants. In southern Illinois, Japanese stiltgrass established at a mean density of 43 seedlings/m². Plant mortality was greatest (≥50%) during seedling establishment (mid-March), dropping to about 20% by July [68]. In central New Jersey, Japanese stiltgrass seedling density in March and April averaged 1,963 seedlings (SD 652)/m², and the seedlings averaged 2 to 6 inches (5-15 cm) in height [28]. Barden [12] estimated the number of plants produced from 1983 to 1986 on a 2-m² plot in North Carolina averaged 1,000 (in 1983), 256 (1984), 44 (1985), and 0 (1986), respectively. Density of Japanese stiltgrass on another 2-m² study plot on the North Carolina site averaged 857 (in 1984), 47 (1985), and 29 (1986) [12].

Sunlight and moist soil increase the chances of Japanese stiltgrass establishment and favor its growth (review by [218]). Establishment and spread are limited in shaded environments [87]. On shaded sites, more carbon is allocated to leaves and aerial stems than to stolons [34] and flowers [87]. However, Japanese stiltgrass is well adapted to shady conditions. It can establish, grow, and produce some seed in as little as 5% of full sunlight [215].

In oak-hickory forests of West Virginia, Japanese stiltgrass was significantly taller along roadsides than within forest interiors; Japanese stiltgrass cover and spread were also higher along roadsides than in forest interiors [86]. On rural and wildland sites in New Jersey, seedling emergence, growth, and seed production of sown Japanese stiltgrass seed was significantly greater on an open lawn than in an interior red maple-shagbark hickory-sweetgum woodland (P<0.05). Japanese stiltgrass density on the lawn averaged 1,573 plants/m², while density in the interior woodland averaged 709 plants/m². Seed production was positively correlated with light (r²=0.06, P>0.05) but not with Japanese stiltgrass density or soil moisture [30].

Litter apparently impairs Japanese seedling establishment [51,137,145]. In a landscape-level study of 3 white oak-sweet birch forests in New Jersey, sites with Japanese stiltgrass had less litter than adjacent uninvaded sites [51]. In an oak-yellow-poplar plantation in southwestern Tennessee, plots where litter was removed in winter experienced 4.5 times the invasion of Japanese stiltgrass compared to plots where winter litter was left intact (P<0.001). At the end of the growing season, Japanese stiltgrass on plots without litter had spread an average 5.45 feet (1.66 m), while Japanese stiltgrass spread on plots with litter averaged 1.20 feet (0.37 m). Japanese stiltgrass cover averaged 48% and 5% on plots without and with litter, respectively. The authors suggested that increased light as a result of litter removal favored Japanese stiltgrass germination and growth [145]. In a harvested white oak-yellow-poplar forest in Tennessee, Japanese stiltgrass spread was greater with litter removal or soil disturbance than on undisturbed sites [118,119]. Measured from plot edges, the distance at which 90% of Japanese stiltgrass plants occurred (P=0.02) and overall mean distance of Japanese stiltgrass spread (P=0.04) were significantly farther with litter removal than without. Outlier Japanese stiltgrass plants (those farthest from the population center) may be of greatest concern in terms of Japanese stiltgrass spread. The distance of outlier Japanese stiltgrass plants was significantly farther in litter-removal and soil-disturbance plots than control plots (P=0.02) The authors suggest that disturbing litter may increase Japanese stiltgrass invasion and spread in eastern hardwood forests, while leaving litter layers intact may slow Japanese stiltgrass invasion [118].

While litter may inhibit Japanese stiltgrass establishment, a greenhouse study suggests litter may not impede growth after seedlings establish. Using soils from oak-hickory and red maple forests of New Jersey, Ross [175] found that regardless of soil origin, leaf litter additions did not significantly decrease growth of established Japanese stiltgrass plants compared to soils without added litter. Additional greenhouse studies using soil from the 2 forests showed arbuscular mycorrhizae had no effect on Japanese stiltgrass growth. Japanese stiltgrass roots were susceptible to arbuscular mycorrhizal colonization, but Japanese stiltgrass height growth was similar with and without arbuscular mycorrhizal colonization [175].

Based on shade and litter manipulations in white oak-red oak-shagbark hickory, red maple-American elm, and white ash-yellow-poplar forests in New Jersey, Schramm and Ehrenfeld [179,180] suggested that deep litter, shade, or their interactions may limit Japanese stiltgrass spread (P=0.05 for all variables). Only seedlings with no litter or a litter layer one-half of average (~0.8 inch (2.2 cm)) showed "substantial" survivorship. There was a trend towards decreasing Japanese stiltgrass cover with increasing successional stage. Japanese stiltgrass was "effectively excluded" where American beech, a late-successional species that casts deep shade at maturity, dominated the canopy, while open, successional red maple- and white ash-dominated forests had 22% to 30% Japanese stiltgrass cover. Oak-hickory forest supported intermediate levels of Japanese stiltgrass (5-8% cover). Regardless of successional stage, there was a trend toward decreasing Japanese stiltgrass invasion with increasing stand size (r²=0.33) [180]. The authors suggested that generally, loss of the shrub layer due to heavy white-tailed deer browsing could accelerate Japanese stiltgrass spread [179,180]. Interactive effects of white-tailed deer and Japanese stiltgrass on stand structure and plant species composition are discussed further in Impacts; see Successional Status for further information on Japanese stiltgrass and shade.

Rauschert and others [168] present a model of Japanese stiltgrass population growth based on broadcast seeding experiments in an oak-hickory-eastern white pine forest in Pennsylvania.

Several other site characteristics, and stand structure, apparently affect Japanese stiltgrass regeneration. In North Carolina, Japanese stiltgrass regeneration was negatively correlated with high soil pH (5.5 vs. a median of 5.1); high levels of soil potassium, zinc, and calcium; high percent silt (18% vs. 10%); deep litter (8.6 vs. 5.5 cm); high cumulative PAR on an overcast day (0.72 vs. 0.57 mol/m²/day); and high leaf area index (LAI) of other species (1.3 vs. 0.7) [12]. In southern Illinois, reproductive success was correlated with soil conditions and canopy cover. Reproduction increased with increasing availability of soil cations and sand content and decreased with increased soil silt content and canopy cover (P<0.05 for all variables) [68].

  • 118. Marshall, Jordan M.; Buckley, David S. 2008. Influence of litter removal and mineral soil disturbance on the spread of an invasive grass in a Central Hardwood forest. Biological Invasions. 10(4): 531-538. [73298]
  • 119. Marshall, Jordan Michael. 2007. Establishment, growth, spread, and ecological impacts of Microstegium vimineum in Central Hardwood forests. Knoxville, TN: The University of Tennessee. 149 p. Dissertation. [80649]
  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 137. Nord, Andrea N.; Mortensen, David A.; Rauschert, Emily S. J. 2010. Environmental factors influence early population growth of Japanese stiltgrass (Microstegium vimineum). Invasive Plant Science and Management. 3(1): 17-25. [80722]
  • 145. Oswalt, Christopher M.; Oswalt, Sonja N. 2007. Winter litter disturbance facilitates the spread of the nonnative invasive grass Microstegium vimineum (Trin.) A. Camus. Forest Ecology and Management. 249(3): 199-203. [68188]
  • 168. Rauschert, Emily S. J.; Mortensen, David A.; Bjornstad, Ottar N.; Nord, Andrea N.; Peskin, Nora. 2010. Slow spread of the aggressive invader, Microstegium vimineum (Japanese stiltgrass). Biological Invasions. 12(3): 563-579. [80724]
  • 175. Ross, Kristen Ann. 2008. The effects of soil manipulations on invasion success of two exotic species, Japanese barberry (Berberis thunbergii) and Japanese stiltgrass (Microstegium vimineum). New Brunswick, NJ: The State University of New Jersey. 147 p. Dissertation. [80529]
  • 179. Schramm, Jonathon W.; Ehrenfeld, Joan G. 2010. Leaf litter and understory canopy shade limit the establishment, growth and reproduction of Microstegium vimineum. Biological Invasions. 12(9): 3195-3204. [80593]
  • 180. Schramm, Jonathon William. 2008. Historical legacies, competition and dispersal control patterns of invasion by a non-native grass, Microstegium vimineum trin. (A. Camus). New Brunswick, NJ: The State University of New Jersey. 160 p. Dissertation. [80530]
  • 215. Virginia Department of Conservation and Recreation, Natural Heritage Program. 2002. Species factsheet: Japanese stilt grass (Microstegium vimineum), [Online]. In: Invasive alien plant species of Virginia. Virginia Native Plant Society (Producer). Available: http://www.vnps.org/invasive/FSMICROS.html [2004, December 21]. [51526]
  • 218. Warren, Robert J., II; Wright, Justin P.; Bradford, Mark A. 2011. The putative niche requirements and landscape dynamics of Microstegium vimineum: an invasive Asian grass. Biological Invasions. 13(2): 471-483. [80733]
  • 28. Cheplick, Gregory P. 2005. Biomass partitioning and reproductive allocation in the invasive, cleistogamous grass Microstegium vimineum: Influence of the light environment. Journal of the Torrey Botanical Society. 132(2): 214-224. [80710]
  • 30. Cheplick, Gregory P. 2010. Limits to local spatial spread in a highly invasive annual grass (Microstegium vimineum). Biological Invasions. 12(6): 1759-1771. [80612]
  • 34. Claridge, Kevin; Franklin, Scott B. 2002. Compensation and plasticity in an invasive plant species. Biological Invasions. 4(4): 339-347. [49779]
  • 51. Ehrenfeld, Joan G. 2003. Soil properties and exotic plant invasions: a two-way street. In: Fosbroke, Sandra L. C.; Gottschalk, Kurt W., eds. Proceedings: U.S. Department of Agriculture interagency research forum on gypsy moth and other invasive species: 13th annual meeting; 2002 January 15-18; Annapolis, MD. Gen. Tech. Rep. NE-300. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 18-19. [44156]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]
  • 86. Huebner, Cynthia D. 2007. Strategic management of five deciduous forest invaders using Microstegium vimineum as a model species. In: Cavender, Nicole, ed. Ohio invasive plants research conference: Continuing partnerships for invasive plant management: proceedings; 2007 January 18; Ironton, OH. Columbus, OH: Ohio Biological Survey: 19-28. [76570]
  • 87. Huebner, Cynthia D. 2010. Establishment of an invasive grass in closed-canopy deciduous forests across local and regional environmental gradients. Biological Invasions. 12(7): 2069-2080. [80739]

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Germination

More info for the terms: fresh, litter

Although seed production can be high [34,215], few seed germination studies had been conducted as of this writing (2010), so Japanese stiltgrass germination requirements are unclear. On some sites, Japanese stiltgrass appears to require cold stratification (review by [89]), which is accomplished in the field by overwintering. A greenhouse study using seed from North Carolina found that fresh seed was not immediately germinable, while seeds stratified for 90 days showed 100% germination [94]. However, Williams [225] reported immediate germination of Japanese stiltgrass seed collected in Great Smoky Mountains National Park.

Open sites and little to no litter favor Japanese stiltgrass germination. In oak-hickory forests of southern Ohio, Japanese stiltgrass germination in general was higher on open than on closed-canopy sites. Roadsides were particularly favorable for germination; Japanese stiltgrass seed sown along roadsides showed significantly better germination than seed sown in closed-canopy forest (P<0.05) [32,120]. Matlack [120] found that Japanese stiltgrass "completely saturates the roadsides in which it occurs". In a white oak-yellow-poplar forest in Tennessee, litter removal down to mineral soil or litter removal to mineral soil plus mineral soil disturbance significantly increased Japanese stiltgrass spread compared to plots with undisturbed litter (P=0.05) [119]. On the Wayne National Forest, Ohio, seedlings rarely occurred on plots with deep litter; they were concentrated on microsites with exposed mineral soil (P<0.003) [32]. In another experiment on the Wayne National Forest, forest floor disturbances that reduced litter were the most important factor in successful Japanese stiltgrass germination (abstract by [194]).

  • 119. Marshall, Jordan Michael. 2007. Establishment, growth, spread, and ecological impacts of Microstegium vimineum in Central Hardwood forests. Knoxville, TN: The University of Tennessee. 149 p. Dissertation. [80649]
  • 120. Matlack, Glenn. 2007. Are roadsides a red carpet for invasive species? In: Cavender, Nicole, ed. Ohio invasive plants research conference, Proceedings: Continuing partnerships for invasive plant management; 2007 January 18; Ironton, OH. Columbus, OH: Ohio Biological Survey: 7-12. [76568]
  • 194. Tardy, William M.; McCarthy, Brian C. 2007. Effects of disturbance on Japanese stiltgrass dispersal and recruitment. In: Cavender, Nicole, ed. Ohio invasive plants research conference: Continuing partnerships for invasive plant management, proceedings; 2007 January 18; Ironton, OH. Columbus, OH: Ohio Biological Survey: 93. Abstract. [76592]
  • 215. Virginia Department of Conservation and Recreation, Natural Heritage Program. 2002. Species factsheet: Japanese stilt grass (Microstegium vimineum), [Online]. In: Invasive alien plant species of Virginia. Virginia Native Plant Society (Producer). Available: http://www.vnps.org/invasive/FSMICROS.html [2004, December 21]. [51526]
  • 225. Williams, Linda Denise. 1998. Factors affecting growth and reproduction in the invasive grass Microstegium vimineum. Boone, NC: Appalachian State University. 59 p. Thesis. [80698]
  • 32. Christen, Douglas C.; Matlack, Glenn R. 2009. The habitat and conduit functions of roads in the spread of three invasive plant species. Biological Invasions. 11(2): 453-465. [73802]
  • 34. Claridge, Kevin; Franklin, Scott B. 2002. Compensation and plasticity in an invasive plant species. Biological Invasions. 4(4): 339-347. [49779]
  • 89. Huebner, Cynthia D.; Olson, Cassandra; Smith, Heather C. 2004. Invasive plants field and reference guide: an ecological perspective of plant invaders of forests and woodlands. NA-TP-05-04. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Area, State and Private Forestry. 42 p. [+ appendices]. [72427]
  • 94. Judge, Caren A.; Neal, J. C. 2003. Japanese stiltgrass seed dormancy characteristics and germination requirements. Proceedings of the Northeastern Weed Science Society. 58: 168-169. [51544]

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Seed banking

More info for the term: marsh

Japanese stiltgrass seeds apparently have short-term persistence in soil [12,68,181,212]. Longevity of soil-stored seed is usually estimated at 3 to 5 years [12,68,201], although one author suggests that seeds may live less than 1 year [225]. On a North Carolina site, soil-stored Japanese stiltgrass seed remained viable for at least 3 years. On a sloped seep in Pennsylvania, most viable Japanese stiltgrass seeds were collected at 0- to 4-inch (10 cm) depths. Most often, Japanese stiltgrass seed was found in the soil when Japanese stiltgrass plants were present in aboveground vegetation [173]. In the greenhouse, a mean of 87.5 Japanese stiltgrass seedlings emerged from 400-cm² soil samples, which were collected in a red maple forest in Arkansas [223].

Japanese stiltgrass seed occurs in waterlogged soils and along waterways as well as in soils beneath upland plant communities. Japanese stiltgrass seed was collected from the seed bank of a tidal freshwater marsh along the Delaware River in New Jersey [109,110]. In swamplands of the Delaware River, Japanese stiltgrass appeared to be replacing native sedges (Cyperaceae) in the ground layer [110]. By the Potomac River in Virginia, Japanese stiltgrass seeds were collected during spring from the seed bank of the high-drift shoreline. Japanese stiltgrass seeds were not found on the driftline in other seasons, and Japanese stiltgrass seeds were not found in any season by trawling along the water surface. The plant community above driftline was a narrowleaf cattail-arrow arum (Typha angustifolia-Peltandra virginica) tidal freshwater marsh [82].

Occasional seed crop failure is probably not limiting for this species. Given a persistent seed bank, Japanese stiltgrass may establish in high densities the year following poor seed production [68].

  • 109. Leck, Mary Allessio. 2003. Seed-bank and vegetation development in a created tidal freshwater wetland on the Delaware River, Trenton, New Jersey, USA. Wetlands. 23(2): 310-343. [70387]
  • 110. Leck, Mary Allessio; Leck, Charles F. 2005. Vascular plants of a Delaware River tidal freshwater wetland and adjacent terrestrial areas: seed bank and vegetation comparisons of reference and constructed marshes and annotated species list. Journal of the Torrey Botanical Society. 132(2): 323-354. [60627]
  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 173. Romanello, Genevieve Allen. 2009. Microstegium vimineum invasion in central Pennsylvanian slope, seep wetlands site comparisons, seed bank investigation and water as a vector for dispersal. University Park, PA: The Pennsylvania State University. 104 p. Thesis. [80653]
  • 181. Shaw, Rebekha Jean Archibald. 2009. Shrinking the Janzen-Connell doughnut: consequences of an invasive multiplier (Microstegium vimineum) on the mid-canopy in a mixed pine-oak forest. Richmond, VA: Virginia Commonwealth University. 44 p. Thesis. [80656]
  • 201. Tu, Mandy. 2000. Element stewardship abstract: Microstegium vimineum, [Online]. In: Managment library--plants. In: The global invasive species team (GIST). Arlington, VA: The Nature Conservancy (Producer). Available: http://www.invasive.org/gist/esadocs/documnts/micrvim.pdf [2011, January 21]. [51450]
  • 212. Vidra, Rebecca L.; Shear, Theodore H.; Stucky, Jon M. 2007. Effects of vegetation removal on native understory recovery in an exotic-rich urban forest. Journal of the Torrey Botanical Society. 134(3): 410-419. [80726]
  • 223. Whisenhunt, Jeremy W. 2008. Microstegium vimineum (Japanese stiltgrass) [Poaceae] in Arkansas: Distribution, ecology and competition. Fayetteville, AR: University of Arkansas. 70 p. Dissertation. [80531]
  • 225. Williams, Linda Denise. 1998. Factors affecting growth and reproduction in the invasive grass Microstegium vimineum. Boone, NC: Appalachian State University. 59 p. Thesis. [80698]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]
  • 82. Hopfensperger, K. N.; Baldwin, A. H. 2009. Spatial and temporal dynamics of floating and drift-line seeds at a tidal freshwater marsh on the Potomac River, USA. Plant Ecology. 201: 677-686. [74198]

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Seed dispersal

More info for the terms: association, cover, presence, restoration

Reviews indicate that wind, water, animals, and humans disperse Japanese stiltgrass seed [17,173,191,201,220]. Japanese stiltgrass often occurs on floodplains [12,68]. Its close association with sites disturbed by heavy machinery implicates machines, fill dirt, and contaminated hay as potential dispersal agents of Japanese stiltgrass seed [17,191,201]. Rivers, ditches, and roads appear to be primary corridors for population expansion [90]. Japanese stiltgrass fruits are light and float easily and the seeds may survive and germinate after "extended periods" of inundation [215], so flooding is a likely means of seed dispersal (see photo above). Japanese stiltgrass cover was greatest on disturbed (developed or frequently mowed) floodplains near the Mississippi River [12]; however, frequent, severe flood scouring can limit Japanese stiltgrass establishment and spread [68]. Awned fruits can catch on fur, feathers, and clothing [17,191,201], but because the fruits are small, even awnless fruits can work their way into fur and clothing [201]. A review reports that Japanese stiltgrass seeds often attach to hikers' clothing [123].

Japanese stiltgrass spreads from roads and trails into wildlands [32,117,130,194], but it usually disperses poorly without dispersal agents. Several studies show that roadways function as both corridors of dispersal and favorable germination sites for Japanese stiltgrass. On multiple sites in southern Ohio, Japanese stiltgrass was locally abundant in small gravel piles left by road graders and along streams and other water channels [32]. In oak-hickory forests of southern Ohio, Japanese stiltgrass established along roadsides. Dispersal apparently occurred when contaminated gravel was spread; further dispersal occurred from water running through spread gravel. The author speculated that running water disperses Japanese stiltgrass from roadsides into forests. Japanese stiltgrass seeds, which in this experiment had no awns and therefore no apparent adaptations for dispersal, dispersed better than seeds of nonnative multiflora rose (Rosa multiflora), which has animal-dispersed seeds, and nonnative coltsfoot (Tussilago farfara), which has wind-dispersed seeds [120]. A Japanese stiltgrass population along a hiking trail in southern Illinois was thought to have established from seed dispersed by tractors used to grade the trail and/or by hikers [68]. In mixed-hardwood communities in the Blue Ridge Mountains of North Carolina, Japanese stiltgrass presence was positively correlated with proximity to streams, closed-canopy sites, and developed sites (P<0.05) [104]. In the Green Ridge State Forest, Maryland, Japanese stiltgrass presence was positively associated (P<0.001) with sites 30 to 490 feet (10-150 m) from roads [130]. On the Daniel Boone National Forest, Kemtucky, Japanese stiltgrass spread onto new roads, onto old roads after road grading, and along streambanks after stream restoration. In all cases, Japanese stiltgrass spread from small source populations on sites where heavy equipment was used [197].

In closed-canopy forests on the Monongahela National Forest, West Virginia, soil-stored Japanese stiltgrass seed was found only within 30 feet (10 m) of roadsides, although patches of Japanese stiltgrass were found in forest interiors. The author surmised that secondary seed dispersal accounted for Japanese stiltgrass establishment in interior locations. Average seed spread rate across locations was 0.95 foot (0.29 m)/year [88]; possible methods of dispersal were not investigated.

  • 104. Kuhman, Timothy R.; Pearson, Scott M.; Turner, Monica G. 2010. Effects of land-use history and the contemporary landscape on non-native plant invasion at local and regional scales in the forest-dominated southern Appalachians. Landscape Ecology. 25(9): 1433-1445. [80577]
  • 117. Manee, Christina Ann. 2008. The effect of roads on the distribution of Microstegium vimineum. Cullowhee, NC: Western Carolina University. 35 p. Thesis. [80514]
  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 120. Matlack, Glenn. 2007. Are roadsides a red carpet for invasive species? In: Cavender, Nicole, ed. Ohio invasive plants research conference, Proceedings: Continuing partnerships for invasive plant management; 2007 January 18; Ironton, OH. Columbus, OH: Ohio Biological Survey: 7-12. [76568]
  • 123. Mehrhoff, L. J.; Silander, J. A., Jr.; Leicht, S. A.; Mosher, E. S.; Tabak, N. M. 2003. IPANE: Invasive Plant Atlas of New England, [Online]. Storrs, CT: University of Connecticut, Department of Ecology and Evolutionary Biology (Producer). Available: http://nbii-nin.ciesin.columbia.edu/ipane/ [2010, September 27]. [70356]
  • 130. Mortensen, David A.; Rauchert, Emily S. J.; Nord, Andre N.; Jones, Brian P. 2009. Forest roads facilitate the spread of invasive plants. Invasive Plant Science and Management. 2(3): 191-199. [76168]
  • 17. Bean, Ellen; McClellan, Linnea, tech. eds. 1997. Japanese grass or eulalia--Microstegium vimineum (Trin.) A. Camus, [Online]. In: Tennessee exotic plant management manual. Southeast Exotic Pest Plant Council (Producer). Available: http://www.se-eppc.org/states/doc.cfm?id=499 [2004, December 14]. [51455]
  • 173. Romanello, Genevieve Allen. 2009. Microstegium vimineum invasion in central Pennsylvanian slope, seep wetlands site comparisons, seed bank investigation and water as a vector for dispersal. University Park, PA: The Pennsylvania State University. 104 p. Thesis. [80653]
  • 191. Swearingen, Jil M. 2004. Fact sheet: Japanese stilt grass--Microstegium vimineum (Trin.) Camus, [Online]. In: Weeds gone wild: Alien plant invaders of natural areas. Plant Conservation Alliance's Alien Plant Working Group (Producer). Available: http://www.nps.gov/plants/alien/fact/mivi1.htm [2004, December 10]. [51461]
  • 194. Tardy, William M.; McCarthy, Brian C. 2007. Effects of disturbance on Japanese stiltgrass dispersal and recruitment. In: Cavender, Nicole, ed. Ohio invasive plants research conference: Continuing partnerships for invasive plant management, proceedings; 2007 January 18; Ironton, OH. Columbus, OH: Ohio Biological Survey: 93. Abstract. [76592]
  • 197. Taylor, David D. 2011. [Email to Janet Fryer]. April 11. Regarding stiltgrass. Winchester, KY: Daniel Boone National Forest. On file with: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory, Missoula, MT; FEIS files. [82465]
  • 201. Tu, Mandy. 2000. Element stewardship abstract: Microstegium vimineum, [Online]. In: Managment library--plants. In: The global invasive species team (GIST). Arlington, VA: The Nature Conservancy (Producer). Available: http://www.invasive.org/gist/esadocs/documnts/micrvim.pdf [2011, January 21]. [51450]
  • 215. Virginia Department of Conservation and Recreation, Natural Heritage Program. 2002. Species factsheet: Japanese stilt grass (Microstegium vimineum), [Online]. In: Invasive alien plant species of Virginia. Virginia Native Plant Society (Producer). Available: http://www.vnps.org/invasive/FSMICROS.html [2004, December 21]. [51526]
  • 220. Weber, Ewald. 2003. Invasive plant species of the world: a reference guide to environmental weeds. Cambridge, MA: CABI Publishing. 548 p. [71904]
  • 32. Christen, Douglas C.; Matlack, Glenn R. 2009. The habitat and conduit functions of roads in the spread of three invasive plant species. Biological Invasions. 11(2): 453-465. [73802]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]
  • 88. Huebner, Cynthia D. 2010. Spread of an invasive grass in closed-canopy deciduous forests across local and regional environmental gradients. Biological Invasions. 12(7): 2081-2089. [80735]
  • 90. Hunt, David M.; Zaremba, Robert E. 1992. The northeastward spread of Microstegium vimineum (Poaceae) into New York and adjacent states. Rhodora. 94(878): 167-170. [44638]

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Seed production

More info for the terms: cohort, culm, mesic, tiller

Seed production is generally high for Japanese stiltgrass [34,215]. Each Japanese stiltgrass tiller typically produces 1 terminal raceme and 2 to 7 axillary racemes [28]. Consequently, a single tiller can bear many flowers, and a single Japanese stiltgrass tiller may produce 100 to 1,000 seeds [56,215]. Seed production varies between years and among populations, however. Based on a study in Great Smoky Mountains National Park, Williams [225] estimated that a single Japanese stiltgrass plant averages 77 seeds of 80% to 90% viability. A southern Illinois study found a mean of 81.7 spikelets/Japanese stiltgrass culm. However, spikelet production for 4 Japanese stiltgrass populations varied significantly among populations (P<0.001), and seed viability was generally low (33%). The study was conducted during a drought year (1999); even so, seed rain averaged 24.6 seeds/m² (n=34 seed traps) [68]. In New Jersey, Cheplick [29,31] found seed production (both cleistogamous and chasmogamous) averaged about 72 seeds/tiller. The number of tillers produced varied among family lines [31].

Late-season drought can greatly reduce or eliminate Japanese stiltgrass seed production for a cohort [68], and seed production is reduced in low light. In West Virginia, Japanese stiltgrass production of chasmogamous flowers in a dry year was significantly higher in a mesic mixed-hardwood forest than in a dry oak-hickory forest (P=0.03), but there was no significant difference in a year of normal precipitation [87]. In the greenhouse, Japanese stiltgrass produced significantly more fertile spikelets with full sunlight than with 21% or 10% full sunlight (P<0.05). There was no significant difference in Japanese stiltgrass fecundity between the 2 lower levels of sunlight [223]. In oak-hickory forests of West Virginia, Japanese stiltgrass seed production was significantly higher along roadsides than in forest interiors [86].

Greenhouse and field experiments showed that Japanese stiltgrass produces some seed in shade. In the greenhouse, Japanese stiltgrass in 2% to 8% of full sunlight produced fewer chasmogamous and cleistogamous flowers and allocated more biomass to leaves compared to plants raised in full sunlight. Field trials produced similar results. In sweetgum-red maple-pin oak (Quercus palustris) forests in New Jersey, Japanese stiltgrass plants under the forest canopy produced fewer flowers (P≤0.002) and more leaves (P<0.003) than Japanese stiltgrass plants on forest edges. Relative percent of chasmogamous and cleistogamous flowers was similar under the canopy and on forest edges (16% and 11% vs. 6% and 7% of total aboveground biomass for under-canopy and edge locations, respectively) [28].

  • 215. Virginia Department of Conservation and Recreation, Natural Heritage Program. 2002. Species factsheet: Japanese stilt grass (Microstegium vimineum), [Online]. In: Invasive alien plant species of Virginia. Virginia Native Plant Society (Producer). Available: http://www.vnps.org/invasive/FSMICROS.html [2004, December 21]. [51526]
  • 223. Whisenhunt, Jeremy W. 2008. Microstegium vimineum (Japanese stiltgrass) [Poaceae] in Arkansas: Distribution, ecology and competition. Fayetteville, AR: University of Arkansas. 70 p. Dissertation. [80531]
  • 225. Williams, Linda Denise. 1998. Factors affecting growth and reproduction in the invasive grass Microstegium vimineum. Boone, NC: Appalachian State University. 59 p. Thesis. [80698]
  • 28. Cheplick, Gregory P. 2005. Biomass partitioning and reproductive allocation in the invasive, cleistogamous grass Microstegium vimineum: Influence of the light environment. Journal of the Torrey Botanical Society. 132(2): 214-224. [80710]
  • 29. Cheplick, Gregory P. 2007. Plasticity of chamogamous and cleitogamous reproductive allocation in grasses. In: Columbus, J. Travis; Friar, Elizabeth A.; Porter, J. Mark; Prince, Linda M.; Simpson, Michael G., eds. Monocots: Comparative biology and evolution-- Poales. In: Aliso. Claremont, CA: Rancho Santa Ana Botanic Garden; 23: 286-294. [51460]
  • 31. Cheplick, Gregory Paul. 2008. Growth trajectories and size-dependent reproduction in the highly invasive grass Microstegium vimineum. Biological Invasions. 10(5): 761-770. [73301]
  • 34. Claridge, Kevin; Franklin, Scott B. 2002. Compensation and plasticity in an invasive plant species. Biological Invasions. 4(4): 339-347. [49779]
  • 56. Evans, C. W.; Moorhead, D. J.; Bargeron, C. T.; Douce, G. K. 2006. Invasive plant responses to silvicultural practices in the South. Bugwood Network BW-2006-03. Tifton, GA: The University of Georgia Bugwood Network. 52 p. Available online: http://www.invasive.org/silvicsforinvasives.pdf [2010, December 2]. [72425]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]
  • 86. Huebner, Cynthia D. 2007. Strategic management of five deciduous forest invaders using Microstegium vimineum as a model species. In: Cavender, Nicole, ed. Ohio invasive plants research conference: Continuing partnerships for invasive plant management: proceedings; 2007 January 18; Ironton, OH. Columbus, OH: Ohio Biological Survey: 19-28. [76570]
  • 87. Huebner, Cynthia D. 2010. Establishment of an invasive grass in closed-canopy deciduous forests across local and regional environmental gradients. Biological Invasions. 12(7): 2069-2080. [80739]

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Pollination and breeding system

More info for the terms: chasmogamy, cleistogamy, cover

Japanese stiltgrass is both self- and cross-pollinated [84]. Chasmogamy and cleistogamy are noted in nonnative Japanese stiltgrass populations in United States populations [15] and native populations in Asia [105,193]. Soil moisture and light intensity may affect flower development and breeding. In a population near Charlotte, North Carolina, Barden [12] found about 10% of plants had chasmogamous flowers, with chasmogamous plants mostly growing in moist, open sites. All Japanese stiltgrass plants growing in heavy shade had cleistogamous flowers. In a southern Illinois population with 80% overstory cover, flowers were mostly cleistogamous [68]. In New York, chasmogamous flowers were most common in shady forests interiors. The ratio of cleistogamous:chasmogamous flowers increased in the greenhouse [29].

Genetic studies in the James River Basin of Virginia suggest considerable gene flow among populations, although other studies show interpopulation differences. In the Virginia study, genetic diversity was higher than expected for an introduced species that can self-pollinate, and the author speculated that cross-pollination within and among populations is common in Japanese stiltgrass. There was genetic evidence of long-distance dispersal of Japanese stiltgrass outside the James River Basin [11]. In a greenhouse study, Japanese stiltgrass showed significant differences among families in the number of tillers produced (P<0.0001) but not in growth rates [31]. Genetic differences in specific leaf area have been noted among populations [49] (see Physiology).

  • 105. Kuoh, C.-S.; Chen, B.-Y. 2003. Spatial and temporal variation in cleistogamy and chasmogamy in Microstegium vimineum (Poaceae) in Taiwan. In: Monocots III: Abstracts--3rd international conference on the comparative biology of the monocotyledons & 4th international symposium on grass systematics and evolution; 2003 March 31 - April 4; Ontario, CA. Claremont, CA: Rancho Santa Ana Botanic Garden: 48-49. [51458]
  • 11. Baker, Stephen Andrew. 2009. Understanding the genetic consequences of rapid range expansion: a case study using the invasive Microstegium vimineum Trin. (Poaceae). Richmond, Va: Virginia Commonwealth University. 62 p. Thesis. [80607]
  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 15. Barkworth, Mary E.; Capels, Kathleen M.; Long, Sandy; Piep, Michael B., eds. 2003. Flora of North America north of Mexico. Volume 25: Magnoliophyta: Commelinidae (in part): Poaceae, part 2. New York: Oxford University Press. 814 p. [68091]
  • 193. Tanaka, Hajime. 1975. Pollination of some Gramineae. Journal of Japanese Botany. 50(1): 25-31. [51501]
  • 29. Cheplick, Gregory P. 2007. Plasticity of chamogamous and cleitogamous reproductive allocation in grasses. In: Columbus, J. Travis; Friar, Elizabeth A.; Porter, J. Mark; Prince, Linda M.; Simpson, Michael G., eds. Monocots: Comparative biology and evolution-- Poales. In: Aliso. Claremont, CA: Rancho Santa Ana Botanic Garden; 23: 286-294. [51460]
  • 31. Cheplick, Gregory Paul. 2008. Growth trajectories and size-dependent reproduction in the highly invasive grass Microstegium vimineum. Biological Invasions. 10(5): 761-770. [73301]
  • 49. Droste, Tyler; Flory, S. Luke; Clay, Keith. 2010. Variation for phenotypic plasticity among populations of an invasive exotic grass. Plant Ecology. 207(2): 297-306. [80571]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]
  • 84. Huebner, Cynthia D. 2003. Vulnerability of oak-dominated forests in West Virginia to invasive exotic plants: temporal and spatial patterns of nine exotic species using herbarium records and land classification data. Castanea. 68(1): 1-14. [46144]

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Regeneration Processes

More info for the terms: breeding system, stolon

Because it is an annual, Japanese stiltgrass invasion and persistence in a community depend on establishment from the seed bank and/or seed dispersed from off-site parents [68,201]. Within a growing season, however, Japanese stiltgrass spreads vegetatively from stolons [12,34]. Depending upon environmental conditions, Japanese stiltgrass appears adaptable in its relative allocation of carbon to leaves and flowers vs. stolons. In field and greenhouse studies near Memphis, Tennessee, allocation to leaves and flowers was greatest on shaded, fertilized plots, while allocation to stolons was greatest on open, fertilized plots. Still, Japanese stiltgrass showed "extreme plasticity" in morphology, producing both flowers and stolons under a wide range of nutrient and light conditions. A combination of infertile soil and low light was least likely to promote flower and seed production. Fertilization increased stolon production, while low light decreased stolon production. But with a combination of either infertile soil and high light or fertile soil and low light, Japanese stiltgrass compensated for the limited resource and produced both flowers and stolons [34].
  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 201. Tu, Mandy. 2000. Element stewardship abstract: Microstegium vimineum, [Online]. In: Managment library--plants. In: The global invasive species team (GIST). Arlington, VA: The Nature Conservancy (Producer). Available: http://www.invasive.org/gist/esadocs/documnts/micrvim.pdf [2011, January 21]. [51450]
  • 34. Claridge, Kevin; Franklin, Scott B. 2002. Compensation and plasticity in an invasive plant species. Biological Invasions. 4(4): 339-347. [49779]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]

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Growth Form (according to Raunkiær Life-form classification)

More info on this topic.

More info for the term: therophyte

Raunkiaer [167] life form:
Therophyte
  • 167. Raunkiaer, C. 1934. The life forms of plants and statistical plant geography. Oxford: Clarendon Press. 632 p. [2843]

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Life Form

More info for the term: graminoid

Graminoid

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Fire Regime Table

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Life History and Behavior

Cyclicity

Phenology

More info on this topic.

More info for the term: phenology

Japanese stiltgrass produces flowers in late summer (August-September); its flowering period is similar across its range (see phenology table below). Plants senesce in early fall [56]. Seed matures until fall frosts and plant death ([68,215], review by [28]), generally from October to December ([105], review by [123]). In the greenhouse, Japanese stiltgrass plants steadily gained biomass from seedling emergence until just before senescence. This ability to continue growth in fall helps Japanese stiltgrass utilize the additional light that becomes available when trees drop their leaves [31].

Japanese stiltgrass phenology
Area Event Season
Carolinas flowers September-October [164]
Florida flowers fall [230]
Illinois seedlings establish May [68]
flowers September-October [128]
disperses seed and dies October-November [68]
New Jersey seedlings emerge late March-late April [28,30]
New York, Central Park flowers early September [39]
North Carolina germinates March
stem expands April
flowers September [12]
disperses seed and dies October [12,200]
Ohio, southern germinates mid-June [32]
Virginia germinates March
flowers October [44]
Eastern United States fruits September-October [15,125,201]
disperses seed and dies September-December [125]
greenhouse seedlings emerge early May
plants die September-early October [31]
  • 105. Kuoh, C.-S.; Chen, B.-Y. 2003. Spatial and temporal variation in cleistogamy and chasmogamy in Microstegium vimineum (Poaceae) in Taiwan. In: Monocots III: Abstracts--3rd international conference on the comparative biology of the monocotyledons & 4th international symposium on grass systematics and evolution; 2003 March 31 - April 4; Ontario, CA. Claremont, CA: Rancho Santa Ana Botanic Garden: 48-49. [51458]
  • 12. Barden, Lawrence S. 1987. Invasion of Microstegium vimineum (Poaceae), an exotic, annual, shade-tolerant, C4 grass, into a North Carolina floodplain. The American Midland Naturalist. 118(1): 40-45. [44655]
  • 123. Mehrhoff, L. J.; Silander, J. A., Jr.; Leicht, S. A.; Mosher, E. S.; Tabak, N. M. 2003. IPANE: Invasive Plant Atlas of New England, [Online]. Storrs, CT: University of Connecticut, Department of Ecology and Evolutionary Biology (Producer). Available: http://nbii-nin.ciesin.columbia.edu/ipane/ [2010, September 27]. [70356]
  • 125. Miller, James H. 2003. Nonnative invasive plants of southern forests: A field guide for identification and control. Gen. Tech. Rep. SRS-62. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 93 p. Available online: http://www.srs.fs.usda.gov/pubs/gtr/gtr_srs062/ [2004, December 10]. [50788]
  • 128. Mohlenbrock, Robert H. 1986. Guide to the vascular flora of Illinois. Revised edition. Carbondale, IL: Southern Illinois University Press. 507 p. [17383]
  • 15. Barkworth, Mary E.; Capels, Kathleen M.; Long, Sandy; Piep, Michael B., eds. 2003. Flora of North America north of Mexico. Volume 25: Magnoliophyta: Commelinidae (in part): Poaceae, part 2. New York: Oxford University Press. 814 p. [68091]
  • 164. Radford, Albert E.; Ahles, Harry E.; Bell, C. Ritchie. 1968. Manual of the vascular flora of the Carolinas. Chapel Hill, NC: The University of North Carolina Press. 1183 p. [7606]
  • 200. Touchette, Brant W.; Romanello, Genevieve A. 2010. Growth and water relations in a central North Carolina population of Microstegium vimineum (Trin.) A. Camus. Biological Invasions. 12(4): 893-903. [80725]
  • 201. Tu, Mandy. 2000. Element stewardship abstract: Microstegium vimineum, [Online]. In: Managment library--plants. In: The global invasive species team (GIST). Arlington, VA: The Nature Conservancy (Producer). Available: http://www.invasive.org/gist/esadocs/documnts/micrvim.pdf [2011, January 21]. [51450]
  • 215. Virginia Department of Conservation and Recreation, Natural Heritage Program. 2002. Species factsheet: Japanese stilt grass (Microstegium vimineum), [Online]. In: Invasive alien plant species of Virginia. Virginia Native Plant Society (Producer). Available: http://www.vnps.org/invasive/FSMICROS.html [2004, December 21]. [51526]
  • 230. Wunderlin, Richard P. 1998. Guide to the vascular plants of Florida. Gainesville, FL: University Press of Florida. 806 p. [28655]
  • 28. Cheplick, Gregory P. 2005. Biomass partitioning and reproductive allocation in the invasive, cleistogamous grass Microstegium vimineum: Influence of the light environment. Journal of the Torrey Botanical Society. 132(2): 214-224. [80710]
  • 30. Cheplick, Gregory P. 2010. Limits to local spatial spread in a highly invasive annual grass (Microstegium vimineum). Biological Invasions. 12(6): 1759-1771. [80612]
  • 31. Cheplick, Gregory Paul. 2008. Growth trajectories and size-dependent reproduction in the highly invasive grass Microstegium vimineum. Biological Invasions. 10(5): 761-770. [73301]
  • 32. Christen, Douglas C.; Matlack, Glenn R. 2009. The habitat and conduit functions of roads in the spread of three invasive plant species. Biological Invasions. 11(2): 453-465. [73802]
  • 39. DeCandido, Robert; Calvanese, Neil; Alvarez, Regina V.; Brown, Matthew I.; Nelson, Tina M. 2007. The naturally occurring historical and extant flora of Central Park, New York City, New York 1857--2007. The Journal of the Torrey Botanical Society. 134(4): 552-569. [72482]
  • 44. Derr, Jeff F. 2003. Introduction to Japanese stiltgrass biology and implications for control programs, [Online]. In: Northeastern Weed Science Society 2004 symposium. Northeastern Weed Science Society (Producer). Available: http://www.newss.org/default/publication/microstegium/Derr%%20abstract.doc [2005, February 9]. [51542]
  • 56. Evans, C. W.; Moorhead, D. J.; Bargeron, C. T.; Douce, G. K. 2006. Invasive plant responses to silvicultural practices in the South. Bugwood Network BW-2006-03. Tifton, GA: The University of Georgia Bugwood Network. 52 p. Available online: http://www.invasive.org/silvicsforinvasives.pdf [2010, December 2]. [72425]
  • 68. Gibson, David J.; Spyreas, Greg; Benedict, Jennifer. 2002. Life history of Microstegium vimineum (Poaceae), an invasive grass in southern Illinois. Journal of the Torrey Botanical Society. 129(3): 207-219. [44637]

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Reproduction

Biology and Spread

Japanese stiltgrass is an annual grass, with all plants dying each fall. It is a colonial species that spreads during the summer and fall by rooting at stem nodes that touch the ground. Individual plants may produce 100 to 1,000 seeds that fall close to the parent plant from both self-fertilizing and cross-fertilizing flowers. Seed may be carried further by water currents during heavy rains or moved in contaminated hay, soil, or potted plants, and on footwear and vehicles. Stiltgrass seed remains viable in the soil for five or more years and germinates readily. Deer and other grazers reportedly do not browse it, though they have been found to spread the seeds. Stiltgrass leaves a thick layer of thatch after dieback each year in heavily invaded areas, and while leaves decompose quickly, stems do not. Like other invasive species, stiltgrass is physiologically adaptive. For example, it is able to withstand low light levels where nutrient levels are sufficient, and able to withstand low nutrient levels where light levels are sufficient. While stiltgrass can photosynthesize in low light conditions and respond quickly to the changing light conditions typically found on the forest floor, the very low light conditions found beneath a multilayered forest canopy will limit its growth.

Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

U.S. National Park Service Weeds Gone Wild website

Source: U.S. National Park Service

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNA - Not Applicable

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

Reasons: Introduced.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© NatureServe

Source: NatureServe

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More info for the term: natural

Information on state-level noxious weed status of plants in the United States is available at Plants Database. The Eastern Region of the USDA, Forest Service, lists Japanese stiltgrass as a Category 1 noxious weed: a nonnative, highly invasive plant that invades natural habitats and replaces native species [205].
  • 205. U.S. Department of Agriculture, Forest Service, Eastern Region. 2004. Eastern Region invasive plants ranked by degree of invasiveness as based on information from states, [Online]. In: Noxious weeds and non-native invasive plants. Section 3: Invasive plants. Milwaukee, WI: Eastern Region (Producer). Available: http://www.fs.fed.us/r9/wildlife/range/weed/Sec3B.htm [2010, November 10]. [46748]

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Management

Impacts and Control

More info for the terms: allelopathy, basal area, cover, density, fire management, forb, hardwood, interference, invasive species, liana, litter, mesic, natural, nonnative species, prescribed fire, presence, restoration, selection, shrub, tree

Impacts:
Invasiveness: Japanese stiltgrass can be highly invasive on disturbed sites [16]. Unpublished surveys from 1992 showed Japanese stiltgrass was the most frequently reported nonnative, invasive annual grass in The Nature Conservancy's US preserves [166]. Characteristics that contribute to Japanese stiltgrass invasion include [34,201]:

  • rapid invasion of disturbed habitats
  • annual life history
  • reproductive plasticity in the face of varying environmental conditions
  • high seed production
  • rapid clonal growth
Compared to uninvaded sites, sites where Japanese stiltgrass is prevalent may show reduced ecosystem function and, on silvicultural sites, timber production may be less.

A 2003 review of vegetation surveys in the eastern United States revealed that Japanese stiltgrass was among the most commonly reported invasive species, and it was the most common invasive annual grass. It was most frequent on floodplains and in mesic forests [114]. It was ranked a high invasive threat in deciduous, coniferous, and mixed forests, grasslands, old fields, riparian zones, and freshwater wetlands of the Northeast [47], and it was ranked a high to moderately-high threat in red oak and eastern hemlock forests of Delaware Water Gap National Recreation Area [85]. As of 2000, the density of Japanese stiltgrass infestations in Dixon State Park, Illinois, ranged from 2.3 stems/m² to 16,706 stems/m² [68].

Surveys show that as of 2008, Japanese stiltgrass occupied about 650,000 acres (260,000 ha) in the Southeast [127], and it was most invasive in Tennessee, North Carolina, and northwestern South Carolina [126]. It is ranked a high invasive threat in upland grasslands and oak-hickory woodlands and a potentially high threat in wet grasslands and palmetto (Arecacae) prairies [187]. In the southern Appalachian region, 8 of 35 federal, state, and private agencies ranked Japanese stiltgrass among their greatest ongoing or potential management problems (behind kudzu (Pueraria montana var. lobata) and multiflora rose) [106]. It was the most frequent (23%) of any nonnative species found in a 2006 survey of riparian forests in North Carolina [213]. Surveys in mixed-hardwood communities in the Blue Ridge Mountains of North Carolina also found Japanese stiltgrass was the most frequent nonnative invasive species, occurring in 100% of watersheds and 84% of plots [104]. In Oak Ridge National Environmental Research Park, Tennessee, Japanese stiltgrass was ranked the most "aggressively invasive" nonnative species based on distribution, abundance, relative difficulty of control, and ability to exclude native plant species. Japanese honeysuckle and Chinese privet were ranked 2nd and 3rd, respectively [48]. Japanese stiltgrass reportedly replaced existing ground vegetation in 3 to 5 years on sites in Great Smoky National Park [185], and it has formed "extensive and dense" infestations in Natural Areas and Parks, managed forests, wetlands, riparian areas, and rights-of-way in Alabama and adjacent states [4].

Because Japanese stiltgrass is an annual, its productivity is more closely tied to yearly climate fluctuations than that of perennial herbaceous species. Annual variations in Japanese stiltgrass productivity can have important effects on forest understory species composition and diversity. On a sweetgum site on the Oak Ridge National Environmental Research Park, Japanese stiltgrass produced 64% as much biomass in a wet year compared to a dry year [19]. Using a model, Holcombe [80] predicts a gain of 51,400 miles² (133,000 km²) in Japanese stiltgrass cover in North America due to climate change.

Ecosystem function: Japanese stiltgrass is associated with changes in ecosystem function, including altered soil characteristics, changes in soil microfaunal composition, lowered plant and animal species diversity, and altered stand structure. These changes may interfere with growth and establishment of native and other invasive nonnative species. Japanese stiltgrass has also been implicated as being allelopathic. Sites with Japanese stiltgrass may also have less coarse woody debris and more fine fuels than uninvaded sites; this is discussed in Fuels.

Soil and soil microfauna changes: Japanese stiltgrass may alter ecosystem function on forest floors and in forest soils [51,53,99,100,101,102,103] by affecting litter layers, soil composition, and species composition of soil microfauna. For example, Kourtev and others [100] reported that Japanese stiltgrass-invaded areas in New Jersey had thinner litter and organic soil layers than sites without Japanese stiltgrass; they attributed these changes to high densities of nonnative earthworms on sites with Japanese stiltgrass. Sites invaded by Japanese stiltgrass have also shown lower levels of soil carbon, nitrogen, and net ammonification [102]; dissimilar soil enzymes; and had significantly higher soil pH compared to uninvaded areas [99,101,103,122]. In white oak forests of New York, Japanese stiltgrass-invaded sites had thinner organic soil horizons, higher soil pH values, and higher levels of available soil nitrate than adjacent uninvaded sites [51]. In a chestnut oak-black oak-red maple forest, an eastern white pine plantation, and an old field in Tennessee, soil beneath Japanese stiltgrass litter had significantly higher pH and phosphorus levels and lower aluminum levels than soil beneath litter from uninvaded plots, regardless of plant community type. Overall, soil invertebrate richness was lower in Japanese stiltgrass litter than in uninvaded litter in all community types, although Japanese stiltgrass litter housed more mite species than litter from uninvaded plots. The authors surmised that in Japanese stiltgrass litter, overall diversity of forest-floor invertebrates may decrease, but mite populations may increase [122]. In white oak and American beech forests of New Jersey, soil microbial communities differed in species composition in Japanese stiltgrass-invaded and uninvaded areas, and nonnative earthworms were more common on Japanese stiltgrass sites compared to uninvaded sites [100,102]. Kourtev and others [99] warn that such drastic changes to soils will likely persist and may encourage reinvasion by Japanese stiltgrass or invasions by other nonnative species.

Japanese stiltgrass may alter soil nutrient cycling [42,43,43,188], although some claim the already altered nutrient status of disturbed sites favors Japanese stiltgrass establishment [79]. In a North Carolina wetland undergoing restoration, sites dominated by Japanese stiltgrass appeared to have decreased nitrogen cycling compared to sites where Japanese stiltgrass was removed. Decomposition and nitrogen release from Japanese stiltgrass litter was about half that of litter of native groundlayer species, and species richness was significantly less on invaded plots than on plots where Japanese stiltgrass was controlled [42,43]. DeMeester [43] concluded that compared to native species, Japanese stiltgrass "is clearly superior in capitalizing resources and suppressing other vegetation". In oak-pine forest in Whitehall Experimental Forest, Georgia, carbon apparently cycled more quickly sites with Japanese stiltgrass than on sites without Japanese stiltgrass. Plots with Japanese stiltgrass showed reduced total organic carbon (24% decline, P<0.09), particulate organic matter (34% decline, P<0.08), mineralizable carbon (a measure of microbially-available carbon; 36% decline, P<0.01), and microbial-biomass carbon (72% decline, P<0.05). The authors suggested that Japanese stiltgrass may accelerate carbon cycling and deplete carbon levels in southern oak-pine forests [188]. In mixed-hardwood and oak-hickory forests of West Virginia, interior forest plots with Japanese stiltgrass had significantly lower soil carbon levels than plots without Japanese stiltgrass (P=0.07) [87].

Changes in soil chemistry and microfaunal composition associated with soil disturbances tend to favor Japanese stiltgrass. Across Fairfax County, Virginia, riparian sites in zones changing from rural to urban had increased sediment deposition, increased available soil phosphorus, and decreased soil nitrogen compared to rural riparian zones. In aboveground Japanese stiltgrass tissues, phosphorus content increased with urbanization, while the nitrogen:phosphorus ratio decreased. The authors suggested that disturbances and changes in soil nutrient levels enhanced the suitability of urbanizing riparian zones as Japanese stiltgrass habitat [79]. Nonnative earthworms may also favor Japanese stiltgrass invasion. In sugar maple and oak-hickory forests of New York and Pennsylvania, biomass of nonnative earthworm species was positively associated with Japanese stiltgrass and 2 other nonnative species, garlic mustard and Japanese barberry. Nonnative earthworm biomass was negatively correlated with leaf litter volume (r= -0.58, P<0.001) [140]. Several studies show that deep litter, which is more typical of early- than late-successional forests, discourages Japanese stiltgrass establishment [32,120,194] (see Germination and Seedling establishment and plant growth). Nuzzo and others [140] suggest that nonnative earthworm species, rather than Japanese stiltgrass, may be driving changes in ecosystem function—such as reduced native plant diversity—in forest communities of the eastern United States, and that nonnative earthworms may facilitate establishment of nonnative plant species.

Japanese stiltgrass may favor insect guilds that use the ground layer as habitat. In a harvested white oak-yellow-poplar forest in Tennessee, there was significantly greater cover of all insect guilds (herbivores, omnivores, carnivores, and scavengers) on sites with than without Japanese stiltgrass (P≤0.05), probably because there was 2.5 times more plant cover on sites with Japanese stiltgrass. Measurements were taken at the end of the growing season (mid-October) [119].

Diversity and stand structure:
Plant species diversity: Sites with Japanese stiltgrass tend to have lower native and total plant species diversity than sites without Japanese stiltgrass [2,3,21,41,68,87,223]. In an oak-yellow-poplar forest in Tennessee, density (r²=0.80, P<0.001) and diversity (r²=0.31, P=0.02) of native woody species was less in Japanese stiltgrass-infested compared to uninfested sites. The authors suggested that regeneration of woody species in southern forests will likely be reduced with Japanese stiltgrass invasion [146]. In a bottomland box elder-yellow-poplar-sycamore forest in Indiana, plots tilled and sown with native herbs and Japanese stiltgrass had significantly different groundlayer species composition than plots tilled and sown with only native herbs. Japanese stiltgrass plots showed 43% lower groundlayer species richness and 38% lower diversity than plots without Japanese stiltgrass. There was a strong negative correlation between Japanese stiltgrass presence and biomass of the sown native herbs (P<0.0001 for all variables) [61,63]. In urban riparian forests of North Carolina, Japanese stiltgrass presence was negatively correlated with presence of white oak, hickories, flowering dogwood, and mapleleaf viburnum (Viburnum acerifolium) (P<0.05). The authors found that light and high soil nutrient levels were positively associated with cover of nonnative species in general (P<0.05), and they suggested that Japanese stiltgrass is competitively excluding woody species in urban riparian forests of the eastern United States [213]. In sweetgum-sycamore and loblolly pine-white oak-sweetgum forests of Mississippi, Japanese stiltgrass presence was significantly associated with low species richness, and Japanese stiltgrass production was less in species-rich plant communities than in species-poor communities (P<0.001) [21]. In mixed hardwood and oak-hickory forests of West Virginia, interior forest plots with Japanese stiltgrass had significantly lower herb, liana, and shrub diversity (P=0.03) and tree seedling richness (P=0.02) and diversity (P=0.07) than plots without Japanese stiltgrass [87]. In surveys within Chesapeake and Ohio Canal National Historic Park, Maryland, plots with Japanese stiltgrass had greater native species diversity than plots without Japanese stiltgrass until August, when Japanese stiltgrass overtopped associated groundlayer species. After that, native species diversity was greater on plots without than with Japanese stiltgrass [2,3].

Animal species diversity and stand structure: In areas with dense white-tailed deer populations, Japanese stiltgrass and white-tailed deer interactions may be altering forest structure, with attendant changes to wildlife populations. White-tailed deer avoid grazing Japanese stiltgrass because it is unpalatable (see IMPORTANCE TO LIVESTOCK AND WILDLIFE). Heavy white-tailed deer browsing of palatable woody species can result in dense cover of Japanese stiltgrass and little woody species regeneration [10,75,221]. Royo and Carson [176] termed this phenomenon a "recalcitrant understory"; such understories can persist for decades, altering forest structure and successional pathways. Baiser and others [10] postulated that in eastern deciduous forests, decreases in bird guilds that nest on the ground, the understory, or the midstory may be partially due to decline of under- and midstory woody species that are subject to heavy white-tailed deer browsing and replacement of the woody species by Japanese stiltgrass. The authors found that from 1980 to 2005, breeding bird guilds using lower forest layers averaged greater population declines than bird species using the canopy for breeding, and the only bird species with increased populations were those nesting in the canopy. This general decline occurred for both resident and neotropical bird species that nest below the canopy. Among these guilds, eastern wood-pewees (midstory nester) and black-billed cuckoos (ground or understory nester) showed greatest declines in abundance [10].

Interference: Japanese stiltgrass may negatively impact establishment and growth of native species. For example, in hardwood floodplain forests of north-central Mississippi, Japanese stiltgrass interfered with growth of native slender woodoats (Chasmanthium laxum), whitegrass, and white oak seedlings. Density of the native species was negatively correlated with that of Japanese stiltgrass (P≤0.03) [22]. Japanese stiltgrass may interfere with production of forage species on rangelands [111].

Japanese stiltgrass may competitively exclude midstory species from germination and establishment sites. Based on germination and shade manipulation experiments conducted in a loblolly pine-red oak-black oak/flowering dogwood/mayapple (Cornus florida/Podophyllum peltatum) forest in Virginia, Shaw [181] suggested that Japanese stiltgrass may interfere with recruitment of midstory species such as eastern redbud (Cercis canadensis) and flowering dogwood (Cornus florida). There were significantly more eastern redbud (Cercis canadensis) germinants on plots without Japanese stiltgrass than on plots with Japanese stiltgrass (P<0.001). There were also more flowering dogwood germinants on plots without Japanese stiltgrass, but on all plots, recruitment of flowering dogwood was too scant for statistical analyses [181].

Silvicultural implications: Japanese stiltgrass is identified as a potentially serious competitor on productive timber sites in the Southeast [12,172,184]. It is implicated in reducing growth of timber species and associated species growing under the canopy. Because it is a tall grass that can form thick lawns, it often overtops and excludes native species. On the Hutcheson Memorial Forest, height of Japanese stiltgrass ranges from 10 to 40 inches (30-100 cm), far taller than most tree seedlings and forest herbs [8]. In red oak-green ash forests of New Jersey, survival of planted red oak and American ash seedlings was less on sites with Japanese stiltgrass than on sites where Japanese stiltgrass was removed (P<0.0001), but survival of associated red maple was not significantly affected by Japanese stiltgrass. Relative growth rates of red oak and American ash were significantly reduced on plots with Japanese stiltgrass (P<0.0001). Overall herbaceous species richness was less on plots with than on plots without Japanese stiltgrass (P=0.02). The author speculated that Japanese stiltgrass interference and white-tailed deer browsing (deer density range: 58-77/km²) have a synergistic, negative effect on oak and ash regeneration in New Jersey forests [8] (see Animal species diversity for more information). On an oak plantation in southwestern Tennessee, Japanese stiltgrass presence was negatively correlated (r= -0.82) with growth of northern red oak seedlings. Four silvicultural treatments were tested: clearcut (all stems >6 inches (20 cm) diameter removed); 2-aged selection cut (harvest to retain a stand basal area of 15 to 20 feet²/acre of residual oaks, hickories, and yellow-poplar);  high-grade cut (all stems >14 inches (36 cm) DBH removed); and a control no-cut treatment. Mean biomass gain of Japanese stiltgrass was greatest with a 2-aged selection cut and least with the no-cut control [144]:

Japanese stiltgrass productivity (lb/acre) by silvicultural treatment in a Tennessee oak plantation [144]
2-aged Clearcut High-grade No cut
3,100 1,800 550 220

In a harvested white oak-yellow-poplar forest in Tennessee, Japanese stiltgrass mean stem length and number of nodes increased as canopy cover decreased, while soil temperature and moisture increased as Japanese stiltgrass cover increased. Leaf area of red maple and yellow-poplar was less in plots with than without Japanese stiltgrass, likely because Japanese stiltgrass outcompeted the hardwoods for soil moisture. Measurements were made at the end of the growing season (mid-October) [119].

Other nonnative species: Japanese stiltgrass may outcompete other nonnative herbs and woody species. Miller and others [127] compared the relative competitive abilities of Japanese stiltgrass and garlic mustard in greenhouse and field experiments. In the greenhouse, they found that in both shaded conditions and open sunlight, Japanese stiltgrass gained more aboveground biomass and had higher rates of photosynthesis than garlic mustard. In the field, Japanese stiltgrass seedlings also gained more biomass and had higher rates of photosynthesis than garlic mustard; additionally, it suffered less mortality and insect herbivory (P<0.001 for all variables). The authors concluded that in eastern forests, Japanese stiltgrass has greater potential than garlic mustard for spread on both open and shaded sites [127].

In a sweetgum plantation in Tennessee, Japanese stiltgrass outcompeted Japanese honeysuckle for light, gaining more height growth and biomass than and shading out Japanese honeysuckle when the 2 species were grown together. Watering increased Japanese stiltgrass's interference with Japanese honeysuckle growth. Since Japanese stiltgrass is an annual, Japanese stiltgrass's negative effect on Japanese honeysuckle growth may decrease as Japanese honeysuckle matures and gains height [18].

Allelopathy: In the laboratory, the inhibitory effect of Japanese stiltgrass extracts on germination of radish (Raphanus sativus) seed was strong enough (β= -0.37) that the authors suspected Japanese stiltgrass may be allelopathic. They called for field studies testing Japanese stiltgrass's possible allelopathy [160].

Control: Control of Japanese stiltgrass is difficult and requires multiple treatments [48]. In order to locally control this annual, seed-banking  grass, repeated annual efforts must be made to prevent flowering and seed set until the seed bank is exhausted [68]. Japanese stiltgrass resembles native white grass, so proper identification of Japanese stiltgrass before control measures are undertaken is advised [125]. Shaw [181] writes that "M. vimineum is proving to be an enigma for scientists because it can grow and succeed in a wide range of habitats. This plasticity makes M. vimineum a difficult weed (in terms of preventing) its invasion and/or (controlling the) spread of existing patches".

Several researchers stress the importance of controlling Japanese stiltgrass along roadsides and trails in order to prevent its invasion into forest interiors [36,117,131]. Because Japanese stiltgrass seed production, cover, and rate of spread were significantly greater along roadsides than within oak-hickory and maple-beech-birch forest interiors of West Virginia, Huebner [86] also recommended making control of Japanese stiltgrass along roadsides a priority.

In all cases where invasive species are targeted for control, no matter what method is employed, the potential for other invasive species to fill their void must be considered [24]. Control of biotic invasions is most effective when it employs a long-term, ecosystem-wide strategy rather than a tactical approach focused on battling individual invaders [116].

Prevention: It is commonly argued that the most cost-efficient and effective method of managing invasive species is to prevent their establishment and spread by maintaining "healthy" natural communities [104,183,183] (for example, avoid road building in wildlands [204]) and monitoring several times each year [91]. Managing to maintain the integrity of the native plant community and mitigate the factors enhancing ecosystem invasibility is likely to be more effective than managing solely to control the invader [78]. Monitoring efforts are best concentrated on the most likely sites of invasion, particularly along potential pathways for Japanese stiltgrass invasion: waterways, roadsides, and adjacent old fields and woodlands. Periodically surveying to detect new invasions is recommended [206]. The Center for Invasive Plant Management provides an online guide to noxious weed prevention practices.

Weed prevention and control can be incorporated into many types of management plans, including those for logging and site preparation, grazing allotments, recreation management, research projects, road building and maintenance, and fire management [206]. Nord and others [137] suggested that Japanese stiltgrass invasion may be prevented if disturbed sites are kept free of Japanese stiltgrass seed and stolons (by, for example, cleaning logging or other equipment coming into disturbed sites), and that disturbed plant communities are likely to become less vulnerable to Japanese stiltgrass over time. The rate of Japanese stiltgrass population expansion decreased with time since disturbance on their Pennsylvanian oak-hickory-eastern white pine forest study sites [137]. See the Guide to noxious weed prevention practices [206] for specific guidelines in preventing the spread of weed seeds and propagules under different management conditions.

Swearingen [191] stresses that preventing the introduction of Japanese stiltgrass into uninfested areas, and early control of small infestations, should be a priority. Removing Japanese stiltgrass plants late in the growing season, before Japanese stiltgrass seed set but after seed set of most associated species, is recommended [68,215]. Once established, Japanese stiltgrass requires major, long-term eradication and restoration efforts. The Nature Conservancy [201] reports high potential for successful control and management of Japanese stiltgrass if it is detected and controlled in the early stages of invasion, but they report only moderate potential for Japanese stiltgrass control and large-scale wildland restoration in areas where Japanese stiltgrass is already well established. Tu [201] provides a contact list of managers who have used control measures (successful or not) on Japanese stiltgrass in Natural Areas.

Fire: For information on the use of prescribed fire to control this species, see Fire Management Considerations.

These methods of Japanese stiltgrass control are discussed below: Physical or mechanical control: Hand-pulling, mowing, tilling, and flooding can help control Japanese stiltgrass. Hand-pulling controls small Japanese stiltgrass infestations [48]. Japanese stiltgrass is shallow-rooted and prefers moist soils; hence, it is usually easy to pull [43,191]. Hand-pulling is most effective in late summer (August-September) [38,191], when plants are tall and branched. Plants pulled before seed set can be left on site; plants with fruits should be bagged and removed. Hand-pulling disturbs the soil, and is likely to create microsites favorable for germination of soil-stored Japanese stiltgrass seed. Late summer pulling is advantageous because soil-stored seed does not have a long enough growing season to establish. Pulling in July or earlier is not recommended. Hand-pulling needs to be continued until the seed bank is exhausted, which may take several years [191,201]. Floodplains and other sites subject to continual replenishment of the seed bank require hand-pulling treatments indefinitely [201]. Japanese stiltgrass rapidly invaded newly contoured streambanks in a wetland undergoing restoration in North Carolina. Hand-pulling for 3 years reduced Japanese stiltgrass (59% vs. 80% cover on weeded and unweeded plots, respectively), but Japanese stiltgrass rapidly invaded the year after weeding stopped [43].

Mowing is recommended late in the growing season (August-September), when plants are flowering but before seed set. Because Japanese stiltgrass is an annual, late-season mowing curtails growth. Early-season mowing does not control Japanese stiltgrass because 1) seed-banked seeds can still establish and produce a new crop of seeds by the end of the growing season, and 2) plants cut in early summer respond with new growth and flower production soon after cutting [44,191,215].

Tilling also reduces Japanese stiltgrass [201]. Soil must be tilled late in the growing season to avoid establishment of soil-stored seed. Tilling may not be appropriate in Natural Areas and may damage desirable plants.

Flooding for 3 straight months, or intermittent inundation, may kill Japanese stiltgrass plants. It may not kill soil-stored seed [201].

Biological control: Japanese stiltgrass has few natural predators and pathogens in North America [34]. No biological control agents were available for Japanese stiltgrass control as of 2010 [191,201]. Biological control of invasive species has a long history that indicates many factors must be considered before using biological controls. Refer to these sources: [211,227] and the Weed control methods handbook [203] for background information and important considerations for developing and implementing biological control programs.

Cultural control: Little information was available on cultural control of Japanese stiltgrass as of 2010, but one study demonstrates how native-species planting after control treatment helped control Japanese stiltgrass. In a 3-year study in a native cane (Arundinaria gigantea) wetland in Palo Verde National Park, Costa Rica, Japanese stiltgrass became dominant on plots where nonnative Chinese privet had been removed and cane was not planted. However, cane became dominant on plots where it was planted after Chinese privet removal, and overall plant species diversity increased compared to plots where Chinese privet was removed but cane was not planted (P≤0.05 for all variables) [143].

Chemical control: Herbicides may provide initial control of a new invasion or a severe infestation, but used alone, they are rarely a complete or long-term solution to invasive species management [26]. Herbicides are most effective on large infestations when incorporated into long-term management plans that include replacement of weeds with desirable species, careful land use management, and prevention of new infestations. Control with herbicides is temporary, as it does not change the conditions that allowed the invasion to occur (for example, [231]). See The Nature Conservancy's [203] Weed Control Methods Handbook for considerations on the use of herbicides in Natural Areas and detailed information on specific chemicals.

Extensive infestations of Japanese stiltgrass can be controlled with systemic herbicides [191]. Herbicides may be the only practical method to effectively control large infestations. Glyphosate may control Japanese stiltgrass [38], but since glyphosate is a nonselective herbicide, care must be taken to avoid drift onto desirable native species. The University of Tennessee reported good control of Japanese stiltgrass on their Ames Plantation, but they also reported that managing for a desirable plant community after Japanese stiltgrass was controlled was "difficult". The University found good control of Japanese stiltgrass with imazameth [201]. Because imazameth is selective for only a few plant species, it killed Japanese stiltgrass plants without killing associated native herbaceous species. Sethoxydim and fluazifop are grass-specific herbicides reported as giving some control for Japanese stiltgrass (Tu 2005 personal communication cited in [202]). See these references for further information on using herbicides to control Japanese stiltgrass: [56,74,95,121,163,163,201,229].

Integrated management: A combination of complementary control methods may be helpful for rapid and effective control of Japanese stiltgrass. Integrated management includes not only killing the target plant, but also establishing desirable species and discouraging nonnative, invasive species over the long term. Japanese stiltgrass control is rarely successful with only one method of control [147], but a combination of control methods may be effective. Unfortunately, few studies on using integrated management to control Japanese stiltgrass had been reported as of 2010.

The best way to prevent large Japanese stiltgrass infestations is to control small patches. Small patches of Japanese stiltgrass in Great Smoky Mountains National Park have been controlled through a combination of herbicides, mowing, and hand-pulling (Johnson 2001 cited in [48]). Prescribed fire may be used in combination with other control methods for Japanese stiltgrass. For example, burning can be used to help reduce litter and standing plant biomass prior to herbicide application for Japanese stiltgrass control [201].

Comparisons of different control methods: A comparison of 5 Japanese stiltgrass control methods in North Carolina suggest hand-pulling or a grass-specific herbicide are good choices for Japanese stiltgrass control. The control treatments were: 1) season-long hand-pulling, 2) fall mowing, 3) a single application of glyphosate in fall, 4) selective hand-pulling of only Japanese stiltgrass, or 5) fenoxaprop (a grass herbicide) application once or twice a year as needed. Fall treatments were done before Japanese stiltgrass was flowering. These treatments were conducted for 3 consecutive years on 2 sites. On the Duke Forest site, Japanese stiltgrass dominated the ground layer of a loblolly pine plantation and was interfering with growth of loblolly pine regeneration. On the Schenck Memorial Forest site, Japanese stiltgrass and sweetgum seedlings dominated the ground layer of a white ash-American elm forest. After 3 years, all treatments reduced Japanese stiltgrass cover and presence in the seed bank compared to control plots. There were no significant differences in Japanese stiltgrass cover among treatments, but native plant recruitment and species richness were highest with selective hand-pulling of Japanese stiltgrass or fenoxaprop applications. Because it reduced recruitment of native woody species the most, glyphosate was considered the least effective for restoration purposes [93,96].

Some Japanese stiltgrass control treatments serve overall restoration objectives better than others. On 3 mixed-hardwood forest sites in southern Indiana, hand-pulling Japanese stiltgrass promoted cover of native grasses better than a postemergent herbicide (fluazifop) the 1st year after treatments, while either hand-pulling or postemergent herbicide best promoted forb cover. However, Japanese stiltgrass invaded hand-pulled areas the spring after treatment. Both pre- and postemergent herbicide prevented Japanese stiltgrass reinvasion the spring after treatment, although postemergent herbicide promoted higher overall native plant diversity. Seeding with native species did not increase native plant diversity over that of unseeded plots in posttreatment year 2 (P<0.05 for all variables) [61,62].
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  • 53. Ehrenfeld, Joan G.; Kourtev, Peter; Huang, Weize. 2001. Changes in soil functions following invasions of exotic understory plants in deciduous forests. Ecological Applications. 11(5): 1287-1300. [44656]
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  • 63. Flory, S. Luke; Clay, Keith. 2010. Non-native grass invasion alters native plant composition in experimental communities. Biological Invasions. 12(5): 1285-1294. [80555]
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  • 75. Griggs, Jennifer A.; Rock, Janet H.; Webster, Christopher R.; Jenkins, Michael A. 2006. Vegetative legacy of a protected deer herd in Cades Cove, Great Smoky Mountains National Park. Natural Areas Journal. 26(2): 126-136. [63293]
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Prevention and Control

Because it is similar in appearance to several native grasses, it is important to know how to recognize and differentiate stiltgrass from look-alikes. Look for asymmetrical leaves with a shiny midrib and the stilt-like growth form. Attention to new infestations should be a priority. Because it is shallow-rooted, stiltgrass may be pulled by hand at any time. If flowering, cut plants back using a mower, weed whip or other device to prevent seed production. For extensive infestations, herbicides are the most practical and effective method currently.

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Relevance to Humans and Ecosystems

Benefits

Cultivation

The preference is partial sun, moist conditions, and mildly acidic to neutral soil containing some loam, including those with clay-loam, sandy loam, and silty loam. However, Japanese Stiltgrass will tolerate situations involving exposure to full sun, light shade, and even medium shade, and it can colonize mesic to slightly dry areas. Even though this grass prefers moist conditions and some shade, it has a C4 metabolism that enables it to grow throughout the summer, regardless of the heat. In eastern North America, including Illinois, this grass can be very invasive, forming large colonies that displace other ground vegetation, therefore it should not be planted. The most effective methods of eradication involve hand-pulling (for small populations), the use of herbicides, and mowing during late summer before the seedheads are produced. The grains can remain viable in the ground for 3-5 years.
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© John Hilty

Source: Illinois Wildflowers

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Importance to Livestock and Wildlife

More info for the terms: bog, cover, density, forbs, fresh, litter

Japanese stiltgrass is unpalatable to deer and livestock [125]. White-tailed deer do not usually graze it, and they may indirectly encourage Japanese stiltgrass spread by avoiding it and foraging on more palatable species [54,191]. In an oak-sugar maple forest in southern Connecticut, white-tailed deer consumed Japanese stiltgrass incidentally but preferred native grasses and forbs [226]. In eastern hemlock forests in the Delaware Water Gap National Recreation Area, Japanese stiltgrass cover increased proportionally with white-tailed deer density [54]. In a red maple-yellow-poplar-white oak cover forest in Great Smoky Mountains National Park, Tennessee, Japanese stiltgrass was the dominant groundlayer species. Cover of Japanese stiltgrass was almost twice that on plots open to white-tailed deer compared to exclosure plots (P=0.059) [75]. Domestic goats and horses generally avoid it [197].

Insects graze Japanese stiltgrass, although the extent of their use was largely unstudied as of 2010. In a red maple-white oak-sycamore forest in the Whitehall Experimental Forest, Georgia, some genera of short-horned grasshoppers, katydids, crickets, and bugs obtained a substantial fraction (35-100%) of their diet from Japanese stiltgrass. Sample sizes ranged from 1 to 10 individuals per insect genus. Insect guilds using early-successional forests may be more likely to use Japanese stiltgrass than insects using forests in later seres. In this study, invertebrates in canopy gaps (where Japanese stiltgrass forage is usually most abundant) tended to actively avoid capture and were mostly green, while invertebrates under closed canopies tended to remain still when detected and had cryptic coloration [20].

Nutritional value: No information was available on the nutritional content of fresh Japanese stiltgrass forage. Strickland and others [188] provide information on the nutritional content of Japanese stiltgrass litter.

Cover value: Japanese stiltgrass may provide important cover for white-footed mice. In loblolly pine-Virginia pine forests of Virginia, white-footed mice were more abundant on plots with than without Japanese stiltgrass. The author suggested that sites with Japanese stiltgrass may provide more nesting sites, nesting materials, and/or have decreased predation rates than sites without Japanese stiltgrass. White-footed mice were observed navigating through dense Japanese stiltgrass culms without difficulty, although they avoided areas with dense cover of native little bluestem. Among 6 other small mammal species, none were either positively or negatively associated with Japanese stiltgrass [217].

Japanese stiltgrass may reduce suitable cover and habitat quality for the federally threatened [208] bog turtle on old-field or resting pastures. In surveys of potential bog turtle habitats in New Jersey and New York, Japanese stiltgrass was present in <10% of wetland plots with bog turtles. On those plots, Japanese stiltgrass was significantly taller (3 feet (0.9 m)) in wetlands that dairy cattle had formerly grazed compared to its height (1 foot (0.3 m)) in ungrazed wetlands (P<0.01). Its cover was also greater in formerly grazed (3.9%) than in ungrazed (2.0%) wetlands, although the difference was not statistically significant. Overall, height of herbaceous species was lower and native species diversity higher on formerly grazed than ungrazed wetlands, and significantly more bog turtles were captured on formerly grazed than ungrazed wetlands (P=0.001) [198].

Japanese stiltgrass may reduce habitat quality of some tick species. In Indiana, experimentally introduced lone star ticks (Amblyomma americanum) and dog ticks (Dermacentor variabilis) showed higher mortality rates in Japanese stiltgrass-invaded plots than in plots without Japanese stiltgrass. In Japanese stiltgrass plots, mortality of lone star ticks and dog ticks increased 173% and 70%, respectively, compared to mortality in uninvaded plots. The authors attributed the higher death rates in Japanese stiltgrass plots to increased temperatures and decreased humidity at the soil surface and in litter compared to uninvaded plots [33].

  • 125. Miller, James H. 2003. Nonnative invasive plants of southern forests: A field guide for identification and control. Gen. Tech. Rep. SRS-62. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 93 p. Available online: http://www.srs.fs.usda.gov/pubs/gtr/gtr_srs062/ [2004, December 10]. [50788]
  • 188. Strickland, Michael S.; Devore, Jayna L.; Maerz, John C.; Bradford, Mark A. 2010. Grass invasion of a hardwood forest is associated with declines in belowground carbon pools. Global Change Biology. 16(4): 1338-1350. [80657]
  • 191. Swearingen, Jil M. 2004. Fact sheet: Japanese stilt grass--Microstegium vimineum (Trin.) Camus, [Online]. In: Weeds gone wild: Alien plant invaders of natural areas. Plant Conservation Alliance's Alien Plant Working Group (Producer). Available: http://www.nps.gov/plants/alien/fact/mivi1.htm [2004, December 10]. [51461]
  • 197. Taylor, David D. 2011. [Email to Janet Fryer]. April 11. Regarding stiltgrass. Winchester, KY: Daniel Boone National Forest. On file with: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory, Missoula, MT; FEIS files. [82465]
  • 198. Tesauro, Jason; Ehrenfeld, David. 2007. The effects of livestock grazing on the bog turtle [Glyptemys (=Clemmys) mughlenbergii]. Herpetologica. 63(3): 293-300. [80705]
  • 20. Bradford, Mark A.; DeVore, Jayna L.; Maerz, John C.; McHugh, Joseph V.; Smith, Cecil L.; Strickland, Michael S. 2010. Native, insect herbivore communities derive a significant proportion of their carbon from a widespread invader of forest understories. Biological Invasions. 12(4): 721-724. [80708]
  • 208. U.S. Department of the Interior, Fish and Wildlife Service, Division of Endangered Species. 2011. Threatened and endangered animals and plants, [Online]. Available: http://www.fws.gov/endangered/wildlife.html. [62042]
  • 217. Warchalowski, Heather P. 2006. Responses of small mammals to invasion by Japanese stilt grass (Microstegium vimineum) in mixed coniferous-deciduous forests of Colonial National Historical Park, Virginia. Frostburg, MD: Frostburg State University. 91 p. Thesis. [80516]
  • 226. Williams, Scott C.; Ward, Jeffrey S.; Ramakrishnan, Uma. 2008. Endozoochory by white-tailed deer (Odocoileus virginianus) across a suburban/woodland interface. Forest Ecology and Management. 255(3-4): 940-947. [70535]
  • 33. Civitello, David J.; Flory, S. Luke; Clay, Keith. 2008. Exotic grass invasion reduces survival of Amblyomma americanum and Dermacentor variabilis ticks (Acari: Ixodidae). Journal of Medical Entomology. 45(5): 867-872. [80713]
  • 54. Eschtruth, Anne K.; Battles, John J. 2009. Acceleration of exotic plant invasion in a forested ecosystem by a generalist herbivore. Conservation Biology. 23(2): 388-399. [74165]
  • 75. Griggs, Jennifer A.; Rock, Janet H.; Webster, Christopher R.; Jenkins, Michael A. 2006. Vegetative legacy of a protected deer herd in Cades Cove, Great Smoky Mountains National Park. Natural Areas Journal. 26(2): 126-136. [63293]

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Other uses and values

Japanese stiltgrass was once used as packaging material and as basket-weaving material. Both historic uses probably contributed to its spread in the United States. It is not used for erosion control, as forage, or as an ornamental [201].
  • 201. Tu, Mandy. 2000. Element stewardship abstract: Microstegium vimineum, [Online]. In: Managment library--plants. In: The global invasive species team (GIST). Arlington, VA: The Nature Conservancy (Producer). Available: http://www.invasive.org/gist/esadocs/documnts/micrvim.pdf [2011, January 21]. [51450]

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Risks

Ecological Threat in the United States

Japanese stiltgrass is especially well adapted to low light conditions. It threatens native plants and natural habitats in open to shady, and moist to dry locations. Stiltgrass spreads to form extensive patches, displacing native species that are not able to compete with it. Where white-tail deer are over-abundant, they may facilitate its invasion by feeding on native plant species and avoiding stiltgrass. Japanese stiltgrass may impact other plants by changing soil chemistry and shading other plants. The interaction between stiltgrass and the Northern Pearly Eye (Enodia anthedon), a member of the brush-footed butterfly family Nymphalidae, is unclear. This butterfly is rare to uncommon along the Potomac River in the Washington, DC area. Its caterpillar eats grasses. Dr. Robert Robbins, a Smithsonian entomologist and butterfly specialist takes weekly walks at Great Falls, Maryland, and made the following observations. The Northern Pearly Eye occurs uncommonly at Great Falls from May to October (maybe 2-15 individuals seen over the entire flight period). Adults were especially common during the summer of 2004. The butterfly became exceedingly common during the summer of 2005 when about 20 adults were seen during a 2 hour walk, especially in the vicinity of stiltgrass, on which a female was observed placing an egg. In May 2006, the butterfly was again common, but the population then crashed, and only 2-3 individuals were seen from June to October 2006. Further investigation is needed to study the potential impacts of stiltgrass on this and possibly other butterflies or other insects that utilize stiltgrass as an alternative host plant.

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U.S. National Park Service Weeds Gone Wild website

Source: U.S. National Park Service

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Ecological Threat in the United States

Stiltgrass threatens native understory vegetation in full sun to deep shade. It readily invades disturbed shaded areas, like floodplains that are prone to natural scouring, and areas subject to mowing, tilling and other soil-disturbing activities including white-tailed deer traffic. It spreads opportunistically following disturbance to form dense patches, displacing native wetland and forest vegetation as the patch expands.

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Wikipedia

Microstegium vimineum

Microstegium vimineum, commonly known as Japanese stiltgrass or Nepalese browntop, is an annual grass that is common in a wide variety of habitats and is well adapted to low light levels.

Geographic range[edit]

It is native in much of South Asia, East Asia as well as parts of Southeast Asia. It can be found from Iran in the west, east to China, south to the Philippines, and has since moved to the United States.

Description[edit]

It typically grows to heights between 40 and 100 cm (1.3 and 3.3 ft) and is capable of rooting at each node. The plant flowers in late summer and produces its seeds in the form of achenes shortly thereafter.[1][2] It is quite similar to and often grows along with the North American grass Leersia virginica, but L. virginica lacks the distinctive silver stripe on the center of the leaf that is present on Japanese stiltgrass and also flowers one to two months earlier.[1][3]

Ecology as an Invasive Species[edit]

The plant was accidentally introduced into the U.S. state of Tennessee around 1919 due to its use as a packing material used to ship porcelain from China. It has spread throughout the Southeastern US and is now found in 26 states.[4] Microstegium most commonly invades along roads, floodplain and other disturbed areas, but will also invade undisturbed habitats .[5][6][7] Whitetail deer, which do not browse the grass, may facilitate spread by browsing on native species and thereby reducing competition for the exotic plant.[8] Invasion of Microstegium can reduce growth and flowering of native species,[9] suppress native plant communities,[10] alter and suppress insect communities,[11] slow plant succession[12] and alter nutrient cycling.[13][14] However, removal of Microstegium can lead to recovery of native plant communities[15][16][17]

Control[edit]

Microstegium vimineum is a warm season grass which can be controlled with pre-emergent herbicides targeted for crabgrass. Post emergent controls can also be successful, such as Calcium acid methanearsonate 8.4% Ortho "Weed-b-Gon" Crabgrass killer for lawns,[3] which contains 2,4-D, and Acclaim Extra as well. Unless noted, surfactants should be added to herbicides for better control. In addition to herbicides, hand weeding and mowing are among the most successful methods of removal. In order to be effective, mowing must be performed before the plants go to seed.[18]

Gallery[edit]

References[edit]

  1. ^ a b Thieret, John W. (2006), "Mictrostegium", in Flora of North America Editorial Committee, eds. 1993+, Flora of North America 25, New York & Oxford: Oxford University Press 
  2. ^ Chen, Shou-liang ; Phillips, Sylvia M. (2007), "Microstegium vimineum", in Wu, Z. Y.; Raven, P.H.; Hong, D.Y., Flora of China 22, Beijing: Science Press; St. Louis: Missouri Botanical Garden Press, p. 593, retrieved 2007-07-14 
  3. ^ a b Swearingen, Jil M.; Adams, Sheherezade (2006). "Japanese Stiltgrass". Plant Conservation Alliance's Alien Plant Working Group. National Park Service. Retrieved 2007-06-27. 
  4. ^ USDA, NRCS. 2012. The PLANTS Database (http://plants.usda.gov, 19 August 2012). National Plant Data Team, Greensboro, NC 27401-4901 USA.
  5. ^ Redman, D.E. 1005. Distribution and habitat types for Nepal Microstegium (Microstegium vimineum) in Maryland and the District of Columbia. Castenea, 60:270-275
  6. ^ Cole, P.G. and J.G. Weltzin. 2005. Environmental correlates of the distribution and abundance of Microstegium vimineum in east Tennessee. Southeastern Naturalis, 3:545-563.
  7. ^ Moretensen, D.A., E.S.J. Rauschert, A.N Nord and B.P. Jones. 2009. Forest roads facilitate the spread of invasive plants. Invasive Plant Science and Management. 2:191-199
  8. ^ Knight TM, Dunn JL, Smith LA, Davis J, Kalisz S (2009) Deer facilitate invasive plant success in a Pennsylvania forest understory. Nat Areas J 29:110–116
  9. ^ Bauer, J.T. and Flory, S.L. 2011. Suppression of the woodland herb Senna hebecarpa by the invasive grass Microstegium vimineum. American Midland Naturalist. 165:105-115.
  10. ^ Flory, S.L. and K. Clay. 2010. Non-native grass invasion alters native plant composition in experimental communities. Biological Invasions 12:1285-1294
  11. ^ Simao, M.C., S.L. Flory, and J.A. Rudgers. 2010. Experimental plant invasion reduces arthropod abundance and richness across multiple trophic levels. Oikos 119:1553-1562.
  12. ^ Flory, S.L. and K. Clay. 2010. Non-native grass invasion suppresses forest succession. Oecologia 164:1029-1038.
  13. ^ Ehrenfeld, J.G. 2003 Effects of exotic plant invasions on soil nutrient cycling processes. Ecosystems 6:503–523
  14. ^ Lee, M., S.L. Flory, and R. Phillips. 2012. Positive feedbacks to growth of an invasive grass through alteration of nitrogen cycling. Oecologia. DOI: 10.1007/s00442-012-2309-9
  15. ^ Flory, S.L. 2010. Management of Microstegium vimineum invasions and recovery of resident plant communities. Restoration Ecology. 18:103-112
  16. ^ Flory, S.L. and K. Clay. 2009. Invasive plant removal method determines native plant community responses. Journal of Applied Ecology. 4:434-442.
  17. ^ DeMeeste, J.E., Richter, D.D. 2010. Restoring restoration: removal of the invasive plant Microstegium vimineum from a North Carolina wetland. Biological Invasions 12:781–793
  18. ^ Kleczewski, N., Flory, S.L. and Nice, G. 2011. An Introduction to Microstegium vimineum (Japanese stiltgrass/Nepalese browntop) an Emerging Invasive Grass in the Eastern United States. Indiana University Department of Biology. www.btny.purdue.edu/weedscience/2011/Microstegium-01.pdf.
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Notes

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This species is very close to Microstegium vimineum, but the plant body and spikelets are much larger, it may be an extreme form of the latter species.
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This taxon represents an extreme local variant from the Micro-stegium vimineum complex. It is distinguished from typical M. vimine-um by the combination of a more delicate habit, broader leaf blades, and a conspicuously reticulately veined lower glume.
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This is a variable species, usually with apparently awnless spikelets, where in fact a weakly developed awn is enclosed within the glumes. Sometimes the awn is exserted and obvious; rarely it is completely absent. The fertile lemma is accompanied by an ovate upper palea, clasping the opposite side of the caryopsis. Additionally an inconspicuous, linear-filiform remnant of the lower floret is often present.
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This is a common grass growing along ditches on hillsides.
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Names and Taxonomy

Taxonomy

Synonyms

Eulalia viminea (Trin.) Kuntze

Eulalia viminea var. variabilis Kuntze [59]

Microstegium vimineum var. imberbe (Nees) Honda

Microstegium vimineum var. vimineum [92]
  • 59. Fernald, Merritt Lyndon. 1950. Gray's manual of botany. [Corrections supplied by R. C. Rollins]. Portland, OR: Dioscorides Press. 1632 p. (Dudley, Theodore R., gen. ed.; Biosystematics, Floristic & Phylogeny Series; vol. 2). [14935]
  • 92. Jones, Stanley D.; Wipff, Joseph K.; Montgomery, Paul M. 1997. Vascular plants of Texas. Austin, TX: University of Texas Press. 404 p. [28762]

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The scientific name for Japanese stiltgrass is Microstegium vimineum (Trin.) A. Camus (Poaceae)
[15,58,71,92,97,128,141,164,230]
  • 128. Mohlenbrock, Robert H. 1986. Guide to the vascular flora of Illinois. Revised edition. Carbondale, IL: Southern Illinois University Press. 507 p. [17383]
  • 141. Ohwi, Jisaburo. 1965. Flora of Japan. Washington, DC: Smithsonian Institution. 1067 p. [50787]
  • 15. Barkworth, Mary E.; Capels, Kathleen M.; Long, Sandy; Piep, Michael B., eds. 2003. Flora of North America north of Mexico. Volume 25: Magnoliophyta: Commelinidae (in part): Poaceae, part 2. New York: Oxford University Press. 814 p. [68091]
  • 164. Radford, Albert E.; Ahles, Harry E.; Bell, C. Ritchie. 1968. Manual of the vascular flora of the Carolinas. Chapel Hill, NC: The University of North Carolina Press. 1183 p. [7606]
  • 230. Wunderlin, Richard P. 1998. Guide to the vascular plants of Florida. Gainesville, FL: University Press of Florida. 806 p. [28655]
  • 58. Fairbrothers, D. E.; Gray, J. R. 1972. Microstegium vimineum (Trin.) A. Camus (Gramineae) in the United States. Bulletin of the Torrey Botanical Club. 99(2): 97-100. [51503]
  • 71. Gleason, Henry A.; Cronquist, Arthur. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. 2nd ed. New York: New York Botanical Garden. 910 p. [20329]
  • 92. Jones, Stanley D.; Wipff, Joseph K.; Montgomery, Paul M. 1997. Vascular plants of Texas. Austin, TX: University of Texas Press. 404 p. [28762]
  • 97. Kartesz, John T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. 1st ed. In: Kartesz, John T.; Meacham, Christopher A. Synthesis of the North American flora (Windows Version 1.0), [CD-ROM]. Chapel Hill, NC: North Carolina Botanical Garden (Producer). In cooperation with: The Nature Conservancy; U.S. Department of Agriculture, Natural Resources Conservation Service; U.S. Department of the Interior, Fish and Wildlife Service. [36715]

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Common Names

Japanese stiltgrass

Asian stiltgrass

Nepalese browntop

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