Setaria setosa
Setaria liebmannii
West Indian bristlegrass, West Indies bristlegrass
Liebmann bristlegrass, Liebmann's bristlegrass
50-100 cm;
nodes usually glabrous.
30-90 cm.
glabrous or finely pubescent, margins ciliate distally;
ligules of 1 mm hairs;
blades 15-20 cm long, 6-12 mm wide, flat or folded, often finely pubescent on both surfaces.
glabrous, margins ciliate;
ligules ciliate;
blades to 20 cm long, 10-20 mm wide, flat, scabrous on both surfaces.
15-20 cm, loosely spikelike, interrupted, attenuate;
rachises often villous;
branches ascending, lower branches about 2.5 cm;
bristles usually solitary, less than 10 mm, antrorsely scabrous.
10-25 cm, loosely spicate;
rachises scabrous;
bristles solitary, 7-15 mm, slender, antrorsely scabrous.
2-2.5 mm, ovate-lanceolate.
2-2.7(3) mm.
about 1/2 as long as the spikelets, 3-veined;
upper glumes about 2/3 as long as the spikelets, 5-7-veined;
lower lemmas equaling the upper lemmas;
lower paleas as long as the upper paleas, broad;
upper lemmas finely and distinctly transversely rugose.
about 1/3 as long as the spikelets, 3-veined;
upper glumes and lower lemmas 7-veined, the 5 central veins coalescing at the apices;
lower paleas absent;
upper lemmas gibbous, strongly and coarsely transversely rugose;
upper paleas similar to the upper lemmas.
= unknown.
= 18.
Setaria setosa
Setaria liebmannii
Setaria setosa is native to the West Indies and Mexico. It is probably a recent introduction to Florida, but appears to be established there. The specimen from New Jersey was from a ballast dump; the species is not established in that state.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Within the Flora region, Setaria liebmannii is known only from southern Arizona, but it is a common species along the Pacific slope from northern Mexico to Nicaragua, usually growing at elevations below 750 m. The five apically coalescing veins and the additional free pair at the periphery are unique among the Setaria species in the Flora region.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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