Sixweeks Muhly

Muhlenbergia depauperata Scribn. Bot. Gaz. 9: 187. 1884
Muhlenhergia Schaffneri F'ourn. Mex. PI. Gram. 85, 1886. fType from Tacuhaya, Mexico.) Muhlenbergia Schaffneri var. longiseta Scribn. Proc. Acad. Phila. 1891: 297. 1891. (Type from
near City of Mexico, Pringle in 1890,) Lycurus Schaffneri Mez, Repert, Sp, Nov, 17: 212. 1921. (Based on Muhlenhergia Schaffneri
Fourn .)
Annual; culms densely cespitose, scaberulous, branching at all the nodes, erect or in large tufts, the outer culms spreading, the branches mostly appressed, the whole plant usually pale or tawny; sheaths glabrous, striate, mostly longer than the internodes; ligule thin, 1-2 mm. long; blades fiat or folded, .scabrous beneath, puberulent on the upper surface, mostly less than 3 cm. long, about 1 mm. wide; panicle narrow, loosely spikelike, usually more than half the entire length of the culm, the branches appressed; glumes narrow, scabrous, the first irregularly bidentate or entire, mostly 1-3 mm. long, occasionally reduced, the second a little longer; lemma narrow, terete, prominently 3-nerved, slightly pubescent along the internerves, 3-4 mm. long, the delicate awn straight, about 1 cm, long.
Type locality: Arizona (Pringle).
Distribution: Open gravelly places, Colorado and Arizona to southern Mexico.