Setaria parviflora
Setaria verticillata
knot-root bristlegrass, knotroot foxtail, marsh bristle grass, yellow bristlegrass
bristly foxtail, bur bristlegrass, hook bristle grass, hook foxtail, rough bristle grass, setaire verticillee
30-120 cm;
nodes glabrous.
30-100 cm;
nodes glabrous.
glabrous;
ligules shorter than 1 mm, of hairs;
blades to 25 cm long, 2-8 mm wide, flat, scabrous above.
glabrous, margins ciliate distally;
ligules to 1 mm, densely ciliate;
blades 5-15 mm wide, flat, abaxial surfaces scabrous.
3-8 (10) cm, of uniform width throughout their length, densely spikelike;
rachises scabro-hispid;
bristles 4-12, 2-12 mm, antrorsely barbed, yellow to purple.
5-15 cm, tapering to the apices;
rachises retrorsely rough hispid;
bristles solitary, 4-7 mm, retrorsely scabrous.
2-2.8 mm, elliptical and turgid.
2-2.3 mm.
glumes about 1/3 as long as the spikelets, 3-veined;
upper glumes 1/2 - 2/3 as long as the spikelets, 5-veined;
lower florets often staminate;
lower lemmas occasionally indurate and faintly transversely rugose;
lower paleas equaling the lower lemmas;
upper lemmas distinctly transversely rugose, often purple-tipped.
glumes 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.
= 36, 72.
= 18, 36, 54, 72, 108.
Setaria parviflora
Setaria verticillata
Setaria parviflora is a common, native species of moist ground. It is most frequent along the Atlantic and Gulf coasts, but it also grows from the Central Valley of California east through the central United States and southward through Mexico to Central America, as well as in the West Indies. The plant from Oregon was found on a ballast dump; the species is not established in that state.
Setaria parviflora is the most morphologically diverse and widely distributed of the indigenous perennial species of Setaria.
(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.)
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WildflowerSearch
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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
