Trisetum irazuense (Kuntze) Hitchc.

Trisetum irazuense (Kuntze) Hitchc. Proc. Biol. Soc
Wash. 40: 82. 1927.
Trisetum gracile Fourn. Mcx. PI. Gram. 108. 1886. (Type from La Joya, Mexico, Liebmann 613.)
Not T. gracile Boiss. 1845. Calamagrostis irazuensis Kuntze, Rev. Gen. 763. 1891. (Type from Irazu, Costa Rica, Kuntze.) Trisetum Fournieranum Hitchc. Contr. U. S. Nat. Herb. 17: 326. 1913. (Based on T. gracile
F'ourn.) Trisetum scahriflorum Hitchc. Contr. U. S. Nat. Herb. 24: 358. 1927. (Type from Colombia,
Pittier 1435.)
Perennial; culms lax, more or less decumbent or spreading, glabrous; ligule erose-dentate, about I mm. long; blades flat, sparsely pilose on both surfaces, mostly 2-3 mm. wide; panicle narrow, somewhat loose and interrupted, nodding, greenish or purplish, 15-20 cm. long, the branches ascending, rather lax, some of them floriferous to the base, the longer as much as S cm. long; spikelets 2-flowered or 3-flowered, 5-8 mm. long, the florets extending above the glumes, the rachilla-joints long-pilose, 1-2 mra. long; glumes scabrous on the keels, mostly on the upper half, or toward the apex only, the first rather narrow, acuminate, I-nerved, 4-5 mm. long, the second broader and rather abruptly acuminate, 3-nerved, 5-6 mm. long; lemmas compressed, lanceolate, slightly toothed, obscurely 5-nerved, scabrous all over the back and somewhat wrinkled or roughened, the lower 5-6 mm. long, the others a little shorter, the callus hairs about 0.5 mm. long; awn inserted one third below the apex, loosely twisted and flexuous for about 2 mm., the terminal part spreading, 5-7 mm. long; palea a little shorter than the lemma.
TvPB locality: Mount Irazu, Costa Rica.
Distribution; Pastures and pSramos, altitude 2000-3000 meters, southern Mexico to Ecuador.

Trisetum irazuense là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Kuntze) Hitchc. miêu tả khoa học đầu tiên năm 1927.