Setaria chapmanii

(Vasey) Pilg.
Common names: Chapman's bristlegrass
Synonyms: Paspalidium chapmanii
Treatment appears in FNA Volume 25. Treatment on page 545.

Plants perennial; cespitose. Culms 40-100 cm, erect, slender; nodes glabrous. Sheaths mostly glabrous, margins ciliate distally; ligules 0.1-0.4 mm, of stiff hairs; blades 15-40 cm long, 2-5 mm wide, those of the basal leaves involute, those of the cauline leaves flat, adaxial surfaces sparsely pilose basally. Panicles to 35 cm, nodding, slender, interrupted; rachises scabridulous; branches 5-20, erect, axes 0.4-3.2 cm, undulating, with 3-12 spikelets in 2 ranks, a single bristle present below the terminal spikelets; bristles 3-6 mm. Spikelets 1.8-2.2 mm, obovate, turgid. Lower glumes 0.6-0.8 mm, about 1/3 as long as the spikelets, 3-veined; upper glumes equaling the upper lemmas, 5-7-veined; lower lemmas equaling the upper lemmas; lower paleas absent; upper lemmas finely and transversely rugose; anthers 0.9-1.1 mm. 2n = unknown.

Discussion

Setaria chapmanii is native to soils of coral or shell origin in the Florida Keys, the Bahamas, Cuba, and the Yucatan Peninsula, Mexico. The absence of the lower palea makes S. chapmanii unusual in subg. Paurochaetium.

Selected References

None.

Lower Taxa

None.
... more about "Setaria chapmanii"
James M. Rominger +
(Vasey) Pilg. +
Chapman's bristlegrass +
Conn. +, N.J. +, N.Y. +, Wash. +, Utah +, W.Va. +, Mich. +, Del. +, D.C +, Wis. +, Iowa +, Pacific Islands (Hawaii) +, Md. +, Mass. +, Maine +, N.H. +, R.I. +, Vt. +, Fla. +, Kans. +, N.Dak. +, Nebr. +, N.Mex. +, Okla. +, S.Dak. +, Wyo. +, Puerto Rico +, Calif. +, Oreg. +, Tex. +, La. +, N.C. +, Tenn. +, S.C. +, Ala. +, Virgin Islands +, Pa. +, Mont. +, Miss. +, Ohio +, Va. +, Colo. +, Alaska +, Ark. +, Ariz. +, Ga. +, Idaho +, Ill. +, Ind. +, Ky. +, Minn. +, Mo. +, Nev. +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Labr.) +, N.S. +, N.W.T. +, Ont. +, P.E.I. +, Que. +, Sask. +  and Yukon +
Paspalidium chapmanii +
Setaria chapmanii +
Setaria subg. Paurochaetium +
species +