Panicum decolorans Kunth

Panicum decolorans H. B. K. Nov. Gen. & Sp. 1: 100. 1815
Plants tinged with purple, branching from the base; culms ascending or erect, usually from a geniculate base, simple or bearing simple, usually sterile branches from the lower one or two nodes, strongly striate or almost grooved, glabrous to sparsely papillose-hispidulous, the nodes appr essed-pubescent or glabrous ; leaf -sheaths short, but sometimes overlapping on the shortened lower internodes, glabrous to sparsely papillose-hispid, ciliate; ligule membranaceousfimbriate, hardly 1 mm. long; blades 8-15 cm. long, 7-10 mm. wide, flat, glabrous on both surfaces or with a few scattered papillae, these with or without short, stiff hairs; panicles finally exserted, 10-18 cm. long, usually not more than one third, but sometimes as much as two thirds as wide, the rather long branches usually narrowly ascending, the short-pediceled spikelets somewhat crowded on approximate, short, appressed branchlets; spikelets 4.5-5.2 mm. long, 1.6 mm. wide, pointed; first glume less than half the length of the spikelet, acute; second glume and sterile lemma subequal, exceeding the fruit and pointed beyond it; fruit 2.8-3.2 mm. long, 1.5 mm. wide.
Typb locality: Queretaro, Queretaro.
Distribution: Central Mexico.