Setaria adhaerans
Setaria subg. Setaria
bur bristlegrass, tropical barbed bristlegrass
25-60 cm.
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.
seldom wider than 20 mm, flat or loosely twisted.
2-6 cm, verticillate, green to purple;
rachises retrorsely rough hispid.
usually contracted, spikelike;
branches short, with 1 or more bristles subtending each spikelet.
1.5-2.2 mm.
obtuse or acutish.
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.
lemmas transversely rugose, rarely smooth.
= 18.
Setaria adhaerans
Setaria subg. Setaria
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 subg. Setaria is represented in subtropical and temperate regions throughout the world and is the best represented subgenus in the Flora region.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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