Setaria setosa |
Setaria leucopila |
|
---|---|---|
West Indian bristlegrass, West Indies bristlegrass |
bristlegrass, plains bristlegrass, streambed bristlegrass, yellow bristlegrass, yellow foxtail |
|
Habit | Plants perennial. | Plants perennial; cespitose. |
Culms | 50-100 cm; nodes usually glabrous. |
20-100 cm. |
Sheaths | glabrous or finely pubescent, margins ciliate distally; ligules of 1 mm hairs; blades 15-20 cm long, 6-12 mm wide, flat or folded, often finely pubescent on both surfaces. |
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 | 15-20 cm, loosely spikelike, interrupted, attenuate; rachises often villous; branches ascending, lower branches about 2.5 cm; bristles usually solitary, less than 10 mm, antrorsely scabrous. |
6-15 cm, tightly spikelike, pale green; rachises scabrous or villous; bristles usually solitary, 4-15 mm, ascending. |
Spikelets | 2-2.5 mm, ovate-lanceolate. |
2.2-2.8(3) mm, elliptical. |
Lower glumes | about 1/2 as long as the spikelets, 3-veined; upper glumes about 2/3 as long as the spikelets, 5-7-veined; lower lemmas equaling the upper lemmas; lower paleas as long as the upper paleas, broad; upper lemmas finely and distinctly transversely rugose. |
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 | = unknown. |
= 54, 68, 72. |
Setaria setosa |
Setaria leucopila |
|
Distribution |
AL; FL; NJ; PR; Virgin Islands |
AR; AZ; CO; FL; NM; OK; TX
|
Discussion | Setaria setosa is native to the West Indies and Mexico. It is probably a recent introduction to Florida, but appears to be established there. The specimen from New Jersey was from a ballast dump; the species is not established in that state. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 25, p. 550. | FNA vol. 25, p. 548. |
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Setaria > subg. Setaria | Poaceae > subfam. Panicoideae > tribe Paniceae > Setaria > subg. Setaria |
Sibling taxa | ||
Name authority | (Sw.) P. Beauv. | (Scribn. & Merr.) K. Schum. |
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