Setaria adhaerans |
Setaria villosissima |
|
---|---|---|
bur bristlegrass, tropical barbed bristlegrass |
hairyleaf bristlegrass |
|
Habit | Plants annual. | Plants perennial; cespitose. |
Culms | 25-60 cm. |
40-100 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. |
villous distally, margins ciliate; ligules about 1 mm, densely ciliate, hairs white; blades 15-30 cm long, 5-8 mm wide, both surfaces villous. |
Panicles | 2-6 cm, verticillate, green to purple; rachises retrorsely rough hispid. |
10-20 cm, loosely spicate; bristles usually solitary, 10-20 mm. |
Spikelets | 1.5-2.2 mm. |
2.8-3 mm. |
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 1/3 as long as the spikelets, broadly ovate, 3-veined; upper glumes nearly equaling the spikelets, 5-7-veined; lower lemmas equaling the upper lemmas, 5-veined; lower paleas about 1/5 as long as the upper paleas, lanceolate; upper lemmas finely and transversely undulate-rugose basally, striate and punctate distally; upper paleas similar, ovate-lanceolate. |
2n | = 18. |
= 54. |
Setaria adhaerans |
Setaria villosissima |
|
Distribution |
AZ; TX |
|
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 villosissima is a rare species that grows on granitic soils in southwestern Texas and northern Mexico. The villous sheaths and blades and large spikelets of S. villosissima aid in its identification. A.S. Hitchcock's (1951) report of Setaria villosissima from Arizona is based on misidentification of a specimen of S. leucophila (Reeder 1994). (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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