Setaria parviflora
Setaria verticillata
knotroot bristlegrass
hooked bristlegrass
sheaths glabrous;
margins ciliate distally;
blades 5–15 mm wide, glabrous to scabrous.
dense; spike-like, 5–15 cm, approximately 0.8 cm wide, tapering to the tips;
bristles solitary, 4–7 mm, retrorsely scabrous.
2–2.3 mm.
lower glumes approximately 33% as long as the spikelets, obtuse, 1(3)-veined;
upper glumes nearly as long as the spikelets.
lower lemmas approximately as long as the spikelets; lower paleas approximately 50% as long as the spikelets; upper lemmas fnely and transversely rugose; upper paleas similar to the upper lemmas.
Setaria parviflora
Setaria verticillata
[This taxon does not have a floristic treatment in Flora of Oregon.]
Disturbed areas, agricultural areas. 50–400m. Col. CA, ID, NV, WA; throughout most of Canada and US, south to Mexico; worldwide. Exotic.
The inflorescence of S. verticillata is slightly narrower and more tapering than that of S. viridis. It also di?ers from the latter in that its bristles are retrorsely scabrous with the roughness pointing downward. This species has become a serious weed in California vineyards.
Barbara Wilson, Richard Brainerd, Nick Otting
- Local floras:
BC, 
CA, 
OR, 
WA - Local Web sites: CalFlora, CalPhotos,
Flora NW, 
PNW Herbaria 
WildflowerSearch
iNaturalist (observations)
USDA Plants Database- LBJ Wildflower Center
- SEINet
- Plants of the World Online
- Encyclopedia of Life
- Wikipedia
- Google Image Search
