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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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MUHLENBERGIA
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PlaceOfPublication
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Syst. Nat. 2:171. 1791.
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Synonym
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Dilepyrum Michx. Fl. Bor. Amer. 1:40. 1803. Podosemuim Desv. Nouv. Bull. Soc. Philom. (Paris) 2:188. 1810. Epicampes Presl, Rel. Haenk. 1:235, pl. 39. 1830.
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Description
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Spikelets 1-flowered, the rachilla disarticulating above the glumes; glumes very short to as long as the floret, 1-nerved, obtuse to acuminate, awnless or awned; lemma 3-nerved, usually rather firm, 3- to 5-nerved, mucronate or awned, with a short usually pilose callus; palea as long as the lemma or nearly so. Annuals or perennials with very slender to coarse culms, flat, folded, or in- volute blades, and narrow, dense, or diffuse panicles of small spikelets.
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Key
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a. Low delicate annuals or widely decumbent-spreading perennials. b. Annuals; culms 8-35 cm. high, very slender, erect or decumbent at the base. c. Panicles open, diffuse; lemma 1.5 mm. long; awns about 5 mm. long _ --- - - _ -_-_- 1. M. TENUISSIMA cc. Panicles narrow, the branches usually appressed, spikelet bearing to the base, the spikelets short-pedicellate; lemma 2 mm. long; awns 10-20 mm. long ---- 2. M. TENELLA bb. Perennials; culms as much as 1 m. long, relatively stout, widely decumbent-spreading, freely branching - 3. M. SETARIOIDES aa. Coarse erect perennials, the lower sheaths conspicuously compressed- keeled. b. Panicles 80 cm. long, partly enclosed in the upper sheath, the branches as much as 15 cm. long, naked in the lower half; lemma glabrous or scabrous on the back near the base, the callus short- bearded; awns 3.5-4 cm. long - 4. M. ATTENUATA bb. Panicles 15-40 cm. long, exserted, the branches mostly 5-10 cm. long; lemma villous across the back near the base; awns 1-2 cm. long 5. M. EMERSLEYI
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