Setaria leucopila

(Scribn. & Merr.) K. Schum.
Common names: Streambed bristlegrass
Treatment appears in FNA Volume 25. Treatment on page 548.

Plants perennial; cespitose. Culms 20-100 cm. Sheaths 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. Panicles 6-15 cm, tightly spikelike, pale green; rachises scabrous or villous; bristles usually solitary, 4-15 mm, ascending. Spikelets 2.2-2.8(3) mm, elliptical. Lower glumes 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. 2n = 54, 68, 72.

Distribution

Okla., N.Mex., Tex., Colo., Ariz., Ark., Fla.

Discussion

Setaria leucopila grows in the southwestern United States and northern Mexico. It is the most common of the perennial "Plains bristlegrasses."

Selected References

None.

Lower Taxa

None.