Setaria leucopila
Setaria parviflora
bristlegrass, plains bristlegrass, streambed bristlegrass, yellow bristlegrass, yellow foxtail
knot-root bristlegrass, knotroot foxtail, marsh bristle grass, yellow bristlegrass
20-100 cm.
30-120 cm;
nodes glabrous.
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.
glabrous;
ligules shorter than 1 mm, of hairs;
blades to 25 cm long, 2-8 mm wide, flat, scabrous above.
6-15 cm, tightly spikelike, pale green;
rachises scabrous or villous;
bristles usually solitary, 4-15 mm, ascending.
3-8 (10) cm, of uniform width throughout their length, densely spikelike;
rachises scabro-hispid;
bristles 4-12, 2-12 mm, antrorsely barbed, yellow to purple.
2.2-2.8(3) mm, elliptical.
2-2.8 mm, elliptical and turgid.
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 1/3 as long as the spikelets, 3-veined;
upper glumes 1/2 - 2/3 as long as the spikelets, 5-veined;
lower florets often staminate;
lower lemmas occasionally indurate and faintly transversely rugose;
lower paleas equaling the lower lemmas;
upper lemmas distinctly transversely rugose, often purple-tipped.
= 54, 68, 72.
= 36, 72.
Setaria leucopila
Setaria parviflora
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 parviflora is a common, native species of moist ground. It is most frequent along the Atlantic and Gulf coasts, but it also grows from the Central Valley of California east through the central United States and southward through Mexico to Central America, as well as in the West Indies. The plant from Oregon was found on a ballast dump; the species is not established in that state.
Setaria parviflora is the most morphologically diverse and widely distributed of the indigenous perennial species of Setaria.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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CA, 
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