Setaria setosa
Setaria grisebachii
West Indian bristlegrass, West Indies bristlegrass
Grisebach bristlegrass, Grisebach's bristlegrass
50-100 cm;
nodes usually glabrous.
30-100 cm;
nodes pubescent, hairs appressed.
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.
with ciliate margins;
ligules ciliate;
blades to 12(25) cm long, to 10(20) mm wide, flat, hispid 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.
3-18 cm, loosely spicate, interrupted, often purple;
rachises hispid;
bristles 1-3, 5-15 mm, flexible, antrorsely scabrous.
2-2.5 mm, ovate-lanceolate.
1.5-2.2 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, distinctly 3-veined, lateral veins coalescing with the central veins below the apices;
upper glumes nearly equaling the upper lemmas, obtuse, 5-veined;
lower lemmas equaling the upper lemmas;
lower paleas about 1/3 as long as the lower lemmas, narrow;
upper lemmas finely and transversely rugose;
upper paleas similar to the upper lemmas.
= unknown.
= unknown.
Setaria setosa
Setaria grisebachii
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 grisebachii is the most widespread and abundant native annual species of Setaria in the south-western United States. It grows in open ground and extends along the central highlands of Mexico to Guatemala, usually at elevations of 750-2500 m. The specimens from Maryland were collected on chrome ore piles; the species is not established in the state.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
WildflowerSearch
iNaturalist
USDA Plants Database
MD Biodiversity
