Setaria adhaerans
Setaria barbata
bur bristlegrass, tropical barbed bristlegrass
corn grass, East Indian bristlegrass, Mary grass
25-60 cm.
50-200 cm;
nodes pubescent.
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.
with ciliate margins distally;
ligules about 1 mm, ciliate;
blades 10-25 mm wide, plicate, both surfaces scabrous, adaxial surfaces with parallel rows of papillose-based hairs.
2-6 cm, verticillate, green to purple;
rachises retrorsely rough hispid.
to 20 cm, open;
branches 2-4 cm, axes villous;
bristles solitary, usually only present below the terminal spikelet on each branch, occasionally below non-terminal spikelets, 5-8 mm, flexible.
1.5-2.2 mm.
2.5-3 mm.
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 mm, orbicular, 3-5-veined;
upper glumes about 2 mm, ovate, 7-veined;
lower lemmas about 2.5 mm, slightly coriaceous, acute;
lower paleas about equaling the lower lemmas in length and width;
upper lemmas about 2.3 mm, strongly transversely rugose;
upper paleas enclosed.
= 18.
= 54, 56.
Setaria adhaerans
Setaria barbata
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 barbata is an African species that was apparently introduced to the Western Hemisphere from Asia. It is now common throughout the West Indies, but rare in the Flora region.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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