Trisetum viride (Kunth) Kunth

Trisetum viride (H.B.K.) Kunth, R€v. Gram. 101. 1829
Avena viridis H.B.K. Nov. Gen. & Sp. 1: 147. 1815.
Trisetarium viride Poir. in Lam. Encyc. Suppl. 5; 366. 1817. (Based on Avena viridis H.B.K.) Deyeuxia viridis Fourn. Bull. Soc. Bot. Fr. 24; 181. 1877. (Based on Trisetum viride Kunth.) Trisetum paniculalum Fourn. Mex. PI. Gram. 109. 1886. (Cumbre de Istepec, southern Mexico, Liebmann 597, nos. 56S and 59S also cited.) Perennial, culms erect, simple, glabrous, 1-1.5 meters tall; sheaths striate, the upper scaberulous; ligule 2-4 mm. long; blades flat, glabrous beneath, somewhat pilose on the upper surface, scabrous on the margin; panicle subverticUlate, spreading, 15-25 cm. long, somewhat nodding at the apex, the axis and branches scabrous; spikelets 3-flowered, the rachilla whitepilose, the callus-hairs in a short dense tuft; glumes about equal, linear, narrow, keeled, green, glabrous, scabrous on the keel, about as long as the spikelet ; lemma lanceolate, 5-nerved at the apex, the nerves extending into 4 short slender teeth, scabrous on the back; awn attached about the middle of the lemma, flexuous or loosely twisted on the lower part, the upper part spreading.
Typb m>cai,ity: Between Salamanca and Qucretaro, Mexico. DisTRrauTiON : Southern Mexico.