Setaria leucopila
Setaria subg. Setaria
bristlegrass, plains bristlegrass, streambed bristlegrass, yellow bristlegrass, yellow foxtail
20-100 cm.
compressed, glabrous, margins villous distally;
ligules 1-2.5 mm, ciliate;
blades 8-25 cm long, 2-5 mm wide, flat or folded, scabrous on both surfaces.
seldom wider than 20 mm, flat or loosely twisted.
6-15 cm, tightly spikelike, pale green;
rachises scabrous or villous;
bristles usually solitary, 4-15 mm, ascending.
usually contracted, spikelike;
branches short, with 1 or more bristles subtending each spikelet.
2.2-2.8(3) mm, elliptical.
obtuse or acutish.
about 1/2 as long as the spikelets, 3-veined;
upper glumes from 3/4 as long as to equaling the florets, 5-veined;
lower lemmas equaling the upper lemmas, 5-veined;
lower paleas 1/2 - 3/4 as long as the upper paleas, lanceolate;
upper lemmas apiculate, finely and transversely rugose;
upper paleas similar.
lemmas transversely rugose, rarely smooth.
= 54, 68, 72.
Setaria leucopila
Setaria subg. Setaria
Setaria leucopila grows in the southwestern United States and northern Mexico. It is the most common of the perennial "Plains bristlegrasses."
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Setaria subg. Setaria is represented in subtropical and temperate regions throughout the world and is the best represented subgenus in the Flora region.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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