Overview

Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Global Range: TX (se and coastal parts of Rio Grande Plains); Mexico: Tamaulipas to Nuevo Leon.

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Range Description

This species is native to southern USA and Mexico. The taxon is reported to occur in Texas, Mississippi and New Mexico in the USA, and in Tamaulipas, San Luis Potosi and Oaxaca in Mexico. It is also reported from Japan where it appears to have naturalized (Clayton et al. 2002).
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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 geniculate, decumbent , or lax, sometimes rooting at nodes, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Plants viscid, sticky, glandular-hairy, Plants with glandular pits or bands below nodes, on branches or lemma, Stem internodes solid or spongy, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves mostly cauline, 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 blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Ligule present, Ligule a fringe of hairs, Inflorescence terminal, Inflorescence an open panicle, openly paniculate, branches spreading, Inflorescence solitary, with 1 spike, fascicle, glomerul e, head, or cluster per stem or culm, Inflorescence branches more than 10 to numerous, Flowers bisexual, Spikelets pedicellate, Spikelets laterally compressed, Spikelet less than 3 mm wide, Spikelets with 3-7 florets, Spikelets with 8-40 florets, Spikelets solitary at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating above the glumes, glumes persistent, Spikelets disarticulating beneath or between the florets, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes distinctly unequal, Glumes shorter than adjacent lemma, Glumes 1 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma similar in texture to glumes, Lemma 3 nerved, Lemma glabrous, Lemma apex acute or acuminate, Lemma awnless, Lemma margins thin, lying flat, Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea shorter than lemma, Palea 2 nerved or 2 keeled, Palea keels winged, scabrous, or ciliate, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear.
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Dr. David Bogler

Source: USDA NRCS PLANTS Database

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Type Information

Isotype for Eragrostis silveana Swallen
Catalog Number: US 1501597
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): W. Silveus
Year Collected: 1931
Locality: San Antonio, near Taft, Texas S along R.R. right of way., Texas, United States, North America
  • Isotype: Swallen, J. R. 1932. Amer. J. Bot. 19: 438.
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Source: National Museum of Natural History Collections

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Isotype for Eragrostis silveana Swallen
Catalog Number: US 1501599
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): W. Silveus
Year Collected: 1931
Locality: San Antonio, near Taft, Texas S along R.R. right of way., Texas, United States, North America
  • Isotype: Swallen, J. R. 1932. Amer. J. Bot. 19: 438.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Isotype for Eragrostis silveana Swallen
Catalog Number: US 1501598
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): W. Silveus
Year Collected: 1931
Locality: San Antonio, near Taft, Texas S along R.R. right of way., Texas, United States, North America
  • Isotype: Swallen, J. R. 1932. Amer. J. Bot. 19: 438.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Isotype for Eragrostis silveana Swallen
Catalog Number: US 1501600
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): W. Silveus
Year Collected: 1931
Locality: San Antonio, near Taft, Texas S along R.R. right of way., Texas, United States, North America
  • Isotype: Swallen, J. R. 1932. Amer. J. Bot. 19: 438.
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Source: National Museum of Natural History Collections

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Holotype for Eragrostis silveana Swallen
Catalog Number: US 1501596
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): W. Silveus
Year Collected: 1931
Locality: San Antonio, near Taft, Texas S along R.R. right of way., Texas, United States, North America
  • Holotype: Swallen, J. R. 1932. Amer. J. Bot. 19: 438.
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Source: National Museum of Natural History Collections

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Ecology

Habitat

Comments: Open ground.

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Habitat and Ecology

Habitat and Ecology
This species is a caespitose, perennial, medium-sized grass which grows in various open habitats, from sandy coastal prairies (halophyte) to clay loam flats, marshes, near roadsides, railroads, and fields from 0 to 100 m asl, over a minimum of seven ecoregions.

Systems
  • Terrestrial
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2013

Assessor/s
Romand-Monnier, F.

Reviewer/s
Scott, J.A.

Contributor/s

Justification
This species is rated as Least Concern due to the large range extent, the fact that it is locally common in its native range and occurs within several conservation units. There are no major threats to this species at present.
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Population

Population
This species is known from ca 35 localities. The taxon is reported to be ruderal in habit and locally common. The taxon is considered to be an invasive weed in Japan (Global Compendium of Weeds, accessed on the 22/10/2009). The size and dynamics of the population are unknown.

Population Trend
Stable
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Threats

Major Threats
There is no current known threat to the survival of this wide ranging, locally common, ruderal grass.
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Management

Conservation Actions

Conservation Actions
This species has been collected within several protected areas. This grass has been given a rounded global status of G5 (i.e., secure) 1993, by NatureServe (NatureServe 2009).
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