Triniochloa laxa Hitchc.

Triniochloa laxa Hitchc. Contr. U. S. Nat. Herb. 17: 304. 1913
Culms densely cespitose, lax, decumbent and rhizomatous at base, the old culms and leaves persistent; sheaths glabrous; ligule 1-3 mm. long; blades flat, scabrous, 15-30 cm. long, 3-4 mm. wide, long-acuminate, smooth and green beneath, scabrous and glaucous above; panicles narrow, few-flowered, scarcely exceeding the upper leaves, the branches few, short and appressed, bearing 1-3 spikelets; spikelets excluding the awn about 15 mm. long; glumes narrow, gradually narrowed to the acute apex, purple at base along the midrib, scarious, glabrous, the first 1-ncrved, 12 mm. long, the second 3-ncrvcd, 15 mm. long; lemma mottled with purple, rounded on the back, about 14 ram. long, 5-nerved, the three central nerves passing into the dorsal awn, the other two extending into the 2 short teeth of the apex; callus densely bearded with white hairs 3-5 mm. long; awn attached about the middle of the lemma and below the short teeth, about 15 mm. long, stout, bent about the middle, loosely twisted below; palea similar to the lemma, nearly as long.
Type locality: Sanchez. Chihuahua {Hitchcock 76S7). Distribution: Known only from the type locality.