Difference between revisions of "Sphenopholis obtusata"

Revision as of 19:17, 24 September 2019

Illustrator: Hana Pazdírková, Linda Ann Vorobik

Culms (9)20-130 cm. Sheaths glabrous or hairy, sometimes scabridulous; ligules (1)1.5-2.5 mm, erose-ciliate, more or less lacerate; blades 5-14 cm long, (1)2-8 mm wide, usually flat, rarely slightly involute, scabrous or pubescent. Panicles (2)5-15(25) cm long, 0.5-2 cm wide, usually erect, often spikelike, spikelets usually densely arranged. Spikelets 2.2-3.6 mm. Lower glumes less than 1/3 as wide as the upper glumes; upper glumes 1.5-2.5 mm, subcucullate, width/length ratio 0.3-0.5, apices rounded to truncate; lowest lemmas 1.9-2.8 mm, usually scabridulous distally; distal lemmas usually smooth on the sides, occasionally scabrous, unawned; anthers 0.2-1 mm. 2n = 14.

Conn., N.J., N.Y., Wash., Del., D.C, Wis., W.Va., Pacific Islands (Hawaii), Mass., Maine, N.H., R.I., Vt., Fla., Wyo., N.Mex., Tex., La., Tenn., N.C., S.C., Pa., Nev., Va., Colo., Miss., Calif., Ala., Kans., N.Dak., Nebr., Okla., S.Dak., Ark., Ill., Ga., Ind., Iowa, Ariz., Idaho, Md., Ohio, Utah, Mo., Minn., Mich., Mont., Alta., B.C., Man., N.B., Ont., Sask., Ky., Oreg.

Discussion

Sphenopholis obtusata grows in prairies, marshes, dunes, forests, and waste places, at 0-2500 m. Its range extends from British Columbia to New Brunswick, through most of the United States, to southern Mexico and the Caribbean. The distal lemmas of S. obtusata are occasionally somewhat scabrous. Such plants can be distinguished from S. nitida (p. 621) by their narrower lower glumes, from S. filiformis (p. 621) by their wider leaves, and from S. pensylvanica (p. 621) by their shorter, unawned spikelets. Hybrids with S. pensylvanica, called Sphenopholis xpallens, have short (0.1-4 mm) awns on the distal lemmas.

Selected References

None.

Lower Taxa