Setaria leucopila
Setaria macrosperma
bristlegrass, plains bristlegrass, streambed bristlegrass, yellow bristlegrass, yellow foxtail
coral bristlegrass
20-100 cm.
1-1.5 m. Sheaths prominently keeled, margins villous;
ligules 1-3 mm;
blades 1-2 cm wide, flat, scabrous.
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.
6-15 cm, tightly spikelike, pale green;
rachises scabrous or villous;
bristles usually solitary, 4-15 mm, ascending.
to 25 cm, loosely spicate;
rachises readily visible, sparsely villous;
bristles 1(2), 15-30 mm, flexible, antrorsely scabrous.
2.2-2.8(3) mm, elliptical.
3-3.2 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 1/3 as long as the spikelets, 3-veined;
upper glumes about 3/4 as long as the spikelets, 5-veined;
lower lemmas equaling the upper lemmas;
lower paleas about 1/2 as long as the upper paleas, hyaline, narrow;
upper lemmas finely and transversely rugose;
upper paleas similar to the upper lemmas.
= 54, 68, 72.
= unknown.
Setaria leucopila
Setaria macrosperma
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 macrosperma grows on shell or coral islands, and occasionally in old fields or hammocks. It is most frequent in Florida, but has been collected in both South Carolina and Georgia. It also grows in the Bahamas and Mexico.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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