Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: Occurs primarily in coastal counties. Eriochloa michauxii occurs from southernmost South Carolina (Beaufort County only) through coastal Georgia (Liberty, McIntosh, Glynn, Charlton Counties), and in Florida from Franklin and Duval Counties south to Dade and Monroe Counties. The var. simpsonii occurs only in Dade, Collier, Lee, and Monroe Counties, Florida.

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Physical Description

Morphology

Physical Description

Perennials, Terrestrial, not aquatic, Rhizomes present, Rhizome short and compact, stems close, Stems nodes swollen or brittle, Stems erect or ascending, Stems terete, round in cross section, or polygonal, Stem nodes bearded or hairy, Stem internodes hollow , Stems with inflorescence less than 1 m tall, Stems with inflorescence 1-2 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades 1-2 cm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, Leaf blades more or less hairy, Ligule present, Ligule a fringed, ciliate, or lobed membrane, Ligule a fringe of hairs, Inflorescence terminal, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence a panicle with narrowly racemose or spicate branches, Inflorescence branches more than 10 to numerous, Flowers bisexual, Spikelets pedicellate, Spikelets dorsally compressed or terete, Spikelet less than 3 mm wide, Spikelets with 1 fertile floret, Spikelets with 2 florets, Spikelet with one perfect floret and one staminate floret, Spikelet with 1 fertile floret and 1-2 sterile florets, Spikelets solitary at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating below the glumes, Spikelets secund, in rows on one side of rachis, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 1 clearly present, the other greatly reduced or absent, Glumes distinctly unequal, Glumes equal to or longer than adjacent lemma, Glumes 3 nerved, Glumes 4-7 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma coriaceous, firmer or thicker in texture than the glumes, Lemma becoming indurate, enclosing palea and caryopsis, Lemma 5-7 nerved, Lemma glabrous, Lemma rugose, with cross wrinkles, or roughened, Lemma apex truncate, rounded, or obtuse, Lemma awnless, Lemma mucronate, very shortly beaked or awned, less than 1-2 mm, Lemma margins inrolled, tightly covering palea and caryopsis , Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea longer than 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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Diagnostic Description

"Panicle open, with a single central axis from which diverge at rather remote intervals 3-20 narrow racemelike lateral panicles, the lower commonly about 10 cm long, gradually diminishing in length upward" (Godfrey and Wooten, 1979).

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Type Information

Isotype for Eriochloa mollis var. longifolia Vasey
Catalog Number: US 81936
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): A. H. Curtiss
Year Collected: 1882
Locality: Key West, Florida Keys, Florida, United States, North America
  • Isotype: Vasey, G. 1886. Bull. Torrey Bot. Club. 13: 25.
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Source: National Museum of Natural History Collections

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Ecology

Habitat

Comments: Brackish and fresh tidal marshes, marshes on islands, wet openings in maritime forests, interdune swales, sand- shell beaches, wet pine-palmetto-hardwood hammocks, wet pine flatwoods. In all these habitats, Eriochloa michauxii prefers full sunlight or light gaps.

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Depth range based on 4 specimens in 1 taxon.

Environmental ranges
  Depth range (m): 0.5 - 0.5
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Life History and Behavior

Life Cycle

Persistence: PERENNIAL

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G3 - Vulnerable

Reasons: Relatively sizeable overall range, but mostly confined to coastal counties. Not distributed evenly throughout range--spotty. Definite threats, but acting over long-term. Many protected sites. Not tracked in state with most populations (Florida). Rare at northern periphery of range.

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Global Short Term Trend: Decline of 10-30%

Comments: Loss of habitat is a long-term trend.

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Threats

Comments: Seaside development, marsh draining, altered hydrology, suburban sprawl.

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