Plants perennial; rhizomatous, rhizomes, short, sometimes knotty. Culms
30-90 cm; nodes glabrous, strigose, or with appressed hairs. Sheaths
with papillose-based hairs, sometimes nearly glabrous, margins ciliate distally;
ligules 1-2 mm, of stiff hairs; blades 4-30 cm long, 1-7 mm wide,
involute, stiff, scabridulous and narrowed basally. Panicles 5-20 cm,
erect, slender, interrupted; rachises scabrous; bristles 2-8 mm.
Spikelets 2.1-4.5 mm, elliptic to obovate, randomly distributed on the
branch axes. Lower glumes 1/2 as long as the spikelets, 5-7-veined; upper
glumes equaling the upper lemmas, 7-9-veined; lower lemmas equaling
the upper lemmas; lower paleas absent; upper lemmas indurate,
finely and transversely rugose; upper paleas similar to the upper lemmas.
Setaria reverchonii grows in sandy prairies and limestone hills from
eastern New Mexico, southwestern Oklahoma, and Texas to northern Mexico.