Muhlenbergia longiglumis Vasey

Muhlenbergia longiglumis Vasey, Contr. U. S. Nat. Herb. 1: 283. 1893.
Perennial; culms densely cespitose, puberulent, firm, slender, 50-90 cm. tall; sheaths scaberulous, overlapping, somewhat keeled, the old bases becoming fibrous; ligule thin, scarious, 4—8 mm. long; blades elongate, folded at base, usually flat above, very scabrous, flexuous, tapering to a fine point, 1-2 mm. wide; panicle narrow, rather loosely contracted, greenish or purplish, slightly nodding, about 35 cm. long, the axis scaberulous, the branches scabrous, appressed or ascending, not strongly overlapping, the lateral pedicels much shorter than the spikelets; glumes about equal, narrow, acuminate, faintly puberulent, 5-6 mm. long; lemma acuminate, faintly scaberulous, rather densely short-pilose on the callus, minutely bifid at apex, the awn slender, scaberulous, flexuous, mostly 4-5 cm. long; palea a little shorter than the lemma.
Type locality: Guadalajara, Mexico (Palmer 766 in 1886).
Distribution: Rocky hills, Guadalajara, Mexico (Palmer 766, Pringle 2365, 11752).