Trisetum cernuum

Common names: Nodding trisetum
Synonyms: Trisetum nutkanense
Treatment appears in FNA Volume 24. Treatment on page 748.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants perennial, with both fertile and sterile shoots; cespitose, not rhizomatous. Culms (30)50-110 cm, clumped, erect, glabrous or pubescent. Leaves 2-3 per culm; sheaths scabridulous or pilose; ligules 1.5-3 mm, truncate, erose to lacerate; blades (8.5)15-20+ cm long, (3)7-12 mm wide, flat, ascending, lax at maturity, often scabridulous. Panicles 10-30 cm long, (1)2-9 cm wide, open, nodding, green or tan, occasionally purple-tinged; branches 2-12+ cm, most, except sometimes the uppermost, spikelet-bearing only towards the apices, with the basal (1/5)1/3-1/2 bare, filiform, flexuous, at least the lowest 1-3 whorls spreading or drooping. Spikelets 6-12 mm, subsessile to pedicellate, pedicels to 2 cm, usually with 2-3 functional florets below 1-2 reduced florets; rachilla internodes and hairs 1-2.5 mm; disarticulation above the glumes, beneath the florets. Glumes unequal; lower glumes 0.75-2(3) mm, subulate; upper glumes 3.5-5 mm long, shorter than the lowest florets, 2-3 times as wide as the lower glumes, widest at or above the middle, ovate or obovate, rounded to the acuminate apices; callus hairs to 1 mm; lemmas 5-6 mm, broadly lanceolate, glabrous, bifid, teeth to 1.3 mm, awned, awns (7)9-14 mm, arising from above midlength to just below the teeth, exceeding the lemma apices, arcuate to flexuous; paleas shorter than the lemmas; anthers about 1 mm. Caryopses 2.5-3.2 mm, densely to sparsely pubescent. 2n = 42.


Trisetum cernuum grows in moist woods, on stream banks, lake and pond shores, and floodplains of the western Flora region. The hairiness of the leaf sheaths varies, often within a plant.

Selected References


Lower Taxa

... more about "Trisetum cernuum"
John H. Rumely +
Nodding trisetum +
Conn. +, Mass. +, Maine +, N.H. +, Vt. +, Wash. +, Colo. +, N.J. +, Wis. +, Pacific Islands (Hawaii) +, Wyo. +, N.Mex. +, Tex. +, La. +, N.C. +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, N.W.T. +, Nunavut +, Ont. +, Que. +, Sask. +, Yukon +, Tenn. +, N.Y. +, Pa. +, Okla. +, S.Dak. +, Calif. +, Nev. +, Va. +, Alaska +, Ariz. +, Idaho +, Utah +, Mo. +, Minn. +, Mich. +, R.I. +, Kans. +, Mont. +, Miss. +  and Oreg. +
Trisetum nutkanense +
Trisetum cernuum +
Trisetum +
species +