Setaria setosa
Setaria villosissima
West Indian bristlegrass, West Indies bristlegrass
hairyleaf bristlegrass
50-100 cm;
nodes usually glabrous.
40-100 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.
villous distally, margins ciliate;
ligules about 1 mm, densely ciliate, hairs white;
blades 15-30 cm long, 5-8 mm wide, both surfaces villous.
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.
10-20 cm, loosely spicate;
bristles usually solitary, 10-20 mm.
2-2.5 mm, ovate-lanceolate.
2.8-3 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, 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.
= unknown.
= 54.
Setaria setosa
Setaria villosissima
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.)
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.)
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