Muhlenbergia argentea Vasey

Muhlenbergia argentea Vasey, Bull. Torrey Club 13: 232 1886.
Epicampes argentea Jones, Contr. West. Bot. 14: 7. 1912. (Based on Muhlenbergia argentea Vasey.)
Perennial; culms cespitose, slender, puberulent, several-noded, about 40 cm. tall; sheaths glabrous, longer than the internodes; ligule thin, acute, 5-8 mm. long; blades flat or loosely involute, glabrous beneath, puberulent on the upper surface, scabrous on the cartilaginous margins, 5-15 cm. long, about 1 mm. wide; panicle narrow, loose, 10-15 cm. long, the axis scabrous, the slender scabrous branches ascending, naked below, the pedicels mostly longer than the spikelets; glumes about equal, thin, oblong, obtuse or somewhat notched, the midnerve extending into a mucro or short awn, the summit minutely pubescent or ciliolate, about 2 mm. long excluding the awn; lemma broad, thin, 3-nerved, minutely pubescent on the lower part of the nerves, 3-4 mm. long, the apex bilobed, the lobes obtuse, about 1 mm. long, the awn from between the lobes, scabrous, slightly flexuous, 5-10 mm. long.
Type locality: .Southwestern Chihuahua (Palmer 160 in 1885). Distribution: Known only from the type collection.