Trisetum palmeri Hitchc.

Trisetum palmeri Hitchc. Contr. U. S. Nat. Herb 17:325. 1913.
Culms cespitose, slender, glabrous, 601 00 cm. tall ; sheaths glabrous or somewhat scabrous ; ligule 3-4 mm. long; blades elongate, nearly or quite equaling the panicle, 1-3 mm. wide, soon involute, scabrous; panicle loose, narrow, 10-20 cm, long, the branches several in rather distant whorls, ascending, the shorter ones spikelet-bearing nearly to the base, the longer 5 cm. long, naked below; spikelets, excluding the awns, 5-6 mm. long, 2-flowered, the rachilla prolonged as a plumose bristle; glumes about 4 ram. long, narrow, tapering to an acute apex, green along the midnerve, the margins scarious, glabrous except the scabrous keel, the first 1-nerved, the second 3-nerved; lemmas about 4 mm. long, rounded on the back, 5-nerved, scabrous, scarioustipped, the apex erose, obtuse, 2-lobed, the awns of both lemmas geniculate, 5-6 mm. long, exserted, attached about the middle; palea slightly exceeding the lemma; callus and rachillajoints pilose with short hairs, the prolongation of the rachilla about one third as long as the upper floret.
Type locality; Otinapa, Durango (Palmer 342).
Distribution; Durango (Palmer 128, 342, 3550) and Jalisco (Ynez Mexia 1659).

Trisetum palmeri là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Hitchc. miêu tả khoa học đầu tiên năm 1913.