Setaria parviflora

(Poir.) Kerguelen
Common names: Knotroot bristlegrass
Synonyms: Setaria imberbis Setaria gracilis Setaria geniculata
Treatment appears in FNA Volume 25. Treatment on page 556.

Plants perennial; rhizomatous, rhizomes short, knotty. Culms 30-120 cm; nodes glabrous. Sheaths glabrous; ligules shorter than 1 mm, of hairs; blades to 25 cm long, 2-8 mm wide, flat, scabrous above. Panicles 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. Spikelets 2-2.8 mm, elliptical and turgid. Lower 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. 2n = 36, 72.


Conn., N.J., N.Y., Del., D.C., W.Va., Pacific Islands (Hawaii), Fla., Puerto Rico, N.Mex., Mass., R.I., La., Tenn., N.C., S.C., Pa., Nev., Va., Virgin Islands, Calif., Ala., Ark., Ill., Ga., Ind., Iowa, Utah, Ariz., Md., Kans., Okla., Tex., Ohio, Mo., Idaho, Wash., Miss., Ky., Oreg.


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.

Selected References


Lower Taxa

... more about "Setaria parviflora"
James M. Rominger +
(Poir.) Kerguelen +
Knotroot bristlegrass +
Conn. +, N.J. +, N.Y. +, Del. +, D.C. +, W.Va. +, Pacific Islands (Hawaii) +, Fla. +, Puerto Rico +, N.Mex. +, Mass. +, R.I. +, La. +, Tenn. +, N.C. +, S.C. +, Pa. +, Nev. +, Va. +, Virgin Islands +, Calif. +, Ala. +, Ark. +, Ill. +, Ga. +, Ind. +, Iowa +, Utah +, Ariz. +, Md. +, Kans. +, Okla. +, Tex. +, Ohio +, Mo. +, Idaho +, Wash. +, Miss. +, Ky. +  and Oreg. +
Setaria imberbis +, Setaria gracilis +  and Setaria geniculata +
Setaria parviflora +
Setaria subg. Setaria +
species +