Setaria adhaerans |
Setaria leucopila |
|
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bur bristlegrass, tropical barbed bristlegrass |
bristlegrass, plains bristlegrass, streambed bristlegrass, yellow bristlegrass, yellow foxtail |
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Habit | Plants annual. | Plants perennial; cespitose. |
Culms | 25-60 cm. |
20-100 cm. |
Sheaths | glabrous throughout; ligules 1-2 mm, of hairs, white; blades usually less than 10 cm long, 5-10 mm wide, flat, broad basally, abaxial surfaces conspicuously strigose with papillose-based hairs, tapering abruptly at the apices; bristles solitary, about 5 mm, retrorsely 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. |
Panicles | 2-6 cm, verticillate, green to purple; rachises retrorsely rough hispid. |
6-15 cm, tightly spikelike, pale green; rachises scabrous or villous; bristles usually solitary, 4-15 mm, ascending. |
Spikelets | 1.5-2.2 mm. |
2.2-2.8(3) mm, elliptical. |
Lower glumes | about 1/2 as long as the spikelets, obtuse, 1(3)-veined; upper glumes nearly as long as the spikelets, 5-7-veined; lower lemmas equaling to slightly exceeding the upper lemmas; lower paleas less than 1/2 as long as the spikelets, scalelike; upper lemmas finely and transversely rugose; upper paleas similar to the upper lemmas. |
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 | = 18. |
= 54, 68, 72. |
Setaria adhaerans |
Setaria leucopila |
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Distribution |
AR; AZ; CO; FL; NM; OK; TX
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Discussion | Setaria adhaerans grows in subtropical regions throughout the world. In North America, it is known from the southern United States, northeastern Mexico, Guatemala, Cuba, and the Bahamas. The Californian record may represent a recent introduction. Setaria adhaerans resembles the temperate S. verticillata, but differs in having shorter panicles, shorter spikelets, glabrous sheath margins, and papillose-based strigose hairs on the blades. (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. 554. | 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 | (Forssk.) Chiov. | (Scribn. & Merr.) K. Schum. |
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