Muhlenbergia biloba Hitchc.

Muhlenbergia biloba Hitchc. Contr. U. S. Nat. Herb 17: 294. 1913.
Bealia mexicana Scribn. in Hack. True Grasses 104. 1890; Beal. Grasses N. Am. 2: 267. 1896.
{Basis of Muhlenbergia biloba Hitchc.) Not Muhlenbergia mexicana Trin. 1824. Epicaynpes mexicana Jones, Contr. West. Bot. 14: 7. 1912. (Based on Bealia ?nexicana Scribn.)
Annual, much-branched at base; culms erect, slender, glabrous, 10-30 cm. tall; sheaths scaberulous, clustered near the base of the plant; ligule thin, 2-3 mm. long, decurrent on the sheath as a thin white margin; blades flat, scaberulous beneath, puberulent on the upper surface, 1-3 cm. long, 1 mm. wide or less; panicles long-exserted, ovoid or pyramidal, open, pale or purplish, 3-7 cm. long, the branches slender, scaberulous, few-flowered, the pedicels slightly thickened below the spikelet and more distinctly scabrous; glumes equal, obtuse, pubescent or somewhat villous, 3 mm. long; lemma a little shorter than the glumes, densely villous on the lower two-thirds, 2-lobed at summit, the lobes about 1 mm. long, obtuse, the awn from between the lobes, scabrous, flexuous, curved about the middle, 5-10 mm. long; palea about as long and broad as the lemma, obtuse, villous on the lower part like the lemma.
Type locality: Chihuahua City iPringle 819).
Distribution: Gravelly hills, Baja California to Durango.