Setaria adhaerans
Setaria verticillata
bur bristlegrass, tropical barbed bristlegrass
bristly foxtail, bur bristlegrass, hook bristle grass, hook foxtail, rough bristle grass, setaire verticillee
25-60 cm.
30-100 cm;
nodes glabrous.
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.
glabrous, margins ciliate distally;
ligules to 1 mm, densely ciliate;
blades 5-15 mm wide, flat, abaxial surfaces scabrous.
2-6 cm, verticillate, green to purple;
rachises retrorsely rough hispid.
5-15 cm, tapering to the apices;
rachises retrorsely rough hispid;
bristles solitary, 4-7 mm, retrorsely scabrous.
1.5-2.2 mm.
2-2.3 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 1/3 as long as the spikelets, obtuse, 1(3)-veined;
upper glumes nearly as long as the spikelets;
lower paleas about 1/2 as long as the spikelets, broad;
upper lemmas finely and transversely rugose;
upper paleas similar to the upper lemmas.
= 18.
= 18, 36, 54, 72, 108.
Setaria adhaerans
Setaria verticillata
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 verticillata is a European adventive that is now common throughout the cooler regions of the contiguous United States and in southern Canada. It is an aggressive weed in the vineyards of central California. Reports of S. carnei Hitchc. from North America are based on misidentification of this species.
Setaria verticillata resembles the S. adhaerans but differs in having longer panicles and spikelets, sheath margins that are ciliate distally, and blades that are scabrous, not hairy. Setaria verticillata is a more northern species than S. adhaerans, but their ranges overlap in the Flora region.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
- Local floras:
BC, 
CA, 
OR, 
WA - Local Web sites: CalFlora, CalPhotos,
Flora NW, 
Go Botany, 
IL Wildflowers, 
KS Wildflowers, 
LA Plants, 
MD Biodiversity, 
MI Flora, 
MN Wildflowers, 
MO Plants, 
PNW Herbaria 
WildflowerSearch
iNaturalist (observations)
USDA Plants Database- LBJ Wildflower Center
- SEINet
- Plants of the World Online
- Encyclopedia of Life
- Wikipedia
- Google Image Search
