Setaria leucopila
Setaria texana
bristlegrass, plains bristlegrass, streambed bristlegrass, yellow bristlegrass, yellow foxtail
Texas bristlegrass
20-100 cm.
30-70 cm, wiry, much branched distally.
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.
keeled, margins ciliate distally;
collars glabrate;
ligules to 1 mm, densely ciliate;
blades 5-15 cm long, 2-4 mm wide, flat, scabrous.
6-15 cm, tightly spikelike, pale green;
rachises scabrous or villous;
bristles usually solitary, 4-15 mm, ascending.
2-6 cm, spikelike, basal portion rarely lobed, tapering distally;
rachises scabrous to puberulent;
bristles solitary, 3-10 mm.
2.2-2.8(3) mm, elliptical.
1.9-2.1 mm.
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.
about 1/2 as long as the spikelets, 3-veined;
upper glumes about 3/4 as long as the spikelets, 5-veined;
lower lemmas nearly equaling the upper lemmas, 5-veined;
lower paleas rudimentary to 1/2 as long as the upper paleas;
upper lemmas finely and transversely rugose;
upper paleas narrow.
= 54, 68, 72.
= 36.
Setaria leucopila
Setaria texana
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 texana grows in shaded habitats on sandy loam soils of the Rio Grande plain of south Texas and northeastern Mexico.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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