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(Last Modified On 10/16/2012)
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(Last Modified On 10/16/2012)
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Genus
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ERAGROSTIS
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PlaceOfPublication
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Icon. Gram. Austr. 4:14. P1. 24. 1809.
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Synonym
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Neeragrostis Bush, Trans. Acad. Sci. St. Louis 13:178. 1903.
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Description
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Spikelets few- to many-flowered, the rachilla disarticulating above the glumes and between the florets, or continuous, the lemmas deciduous, the paleas persistent; glumes acute or acuminate, 1-nerved, or the second rarely 3-nerved, much shorter than the spikelet; lemmas acute or acuminate, keeled or rounded on the back, 3- nerved, the nerves prominent or sometimes obscure; palea 2-nerved, often ciliate on the keels.
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Note
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Annuals or perennials with open or contracted panicles of small or rather large spikelets.
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Key
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a. Plants annual. b. Palea prominently ciliate on the keels. Low delicate grasses. c. Panicles open, loose, the branches spreading -. I. E. AMABILIS cc. Panicles dense, spike-like, the branches closely appressed -. E. CILIARIS bb. Palea not prominently ciliate on the keels. c. Culms creeping, freely branching, forming dense soft mats - 3. E. HYPNOIDES cc. Culms not creeping or forming mats, erect or geniculate at the lower nodes. d. Spikelets grayish-green, pedicellate in open panicles, the lemmas subobtuse -4. E. TEPHROSANTHOS dd. Spikelets pale, tinged with red or reddish-brown, subsessile, fascicled on the branches. e. Lemmas 2-2.5 mm. long, abruptly acute; spikelets mostly 6-10 mm. long -------------5. E. MAYPURENSIS ee. Lemmas 5 mm. long, gradually narrowed from the base; spikelets 10-3 0 mm. long - 6. E. SIMPLICIFLORA aa. Plants perennial. b. Culms 15-60 cm. high, slender; spikelets 4-5 mm. long, 6-12- flowered - -- --7. E. ACUTIFLORA bb. Culms 1-2 m. high, relatively stout; spikelets 5-10 mm. long, 10-1 6-flowered --_ - _ - _ 8. E. DOMINGENSIS
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