Setaria leucopila |
Setaria verticilliformis |
|
---|---|---|
bristlegrass, plains bristlegrass, streambed bristlegrass, yellow bristlegrass, yellow foxtail |
barbed bristlegrass |
|
Habit | Plants perennial; cespitose. | Plants annual. |
Culms | 20-100 cm. |
30-100 cm; nodes glabrous. |
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. |
mostly glabrous, margins ciliate distally; ligules 1-2 mm, of hairs; blades 5-15 mm wide, flat, abaxial surfaces scabrous, adaxial surfaces sparsely villous. |
Panicles | 6-15 cm, tightly spikelike, pale green; rachises scabrous or villous; bristles usually solitary, 4-15 mm, ascending. |
5-15 cm, tapering to the apices, branches verticillate; rachises antrorsely rough hispid, without villous hairs; bristles solitary, 4-7 mm, antrorsely or retrorsely scabrous. |
Spikelets | 2.2-2.8(3) mm, elliptical. |
2-2.3 mm. |
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. |
about 1/3 as long as the spikelets, obtuse, 1(3)-veined; upper glumes nearly as long as the spikelets; lower paleas about 1/2 as long as the spikelets, broad; upper lemmas finely and transversely rugose; upper paleas similar to the upper lemmas. |
2n | = 54, 68, 72. |
= 36. |
Setaria leucopila |
Setaria verticilliformis |
|
Distribution |
AR; AZ; CO; FL; NM; OK; TX
|
AL; DC; MD; MO; NJ; NY; PA; WI |
Discussion | 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 verticilliformis is a European adventive that has been found at scattered, mostly urban, locations in the United States. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 25, p. 548. | FNA vol. 25, p. 554. |
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Setaria > subg. Setaria | Poaceae > subfam. Panicoideae > tribe Paniceae > Setaria > subg. Setaria |
Sibling taxa | ||
Synonyms | S. verticillata var. ambigua | |
Name authority | (Scribn. & Merr.) K. Schum. | Dumort. |
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