Muhlenbergia alamosae Vasey

Muhlenbergia alamosae Vasey, Bot. Gaz. 16: 146. 1891 Perennial; culms cespitose, erect, rather wiry, glabrous, several-noded, 30-60 cm. tall; sheaths glabrous, often flattening and diverging from the culm ; ligule 1-2 mm. long ; blades flat, minutely scaberulous on both surfaces, becoming lax and fiexuous, 5-15 cm. long, 1-3 mm. wide; panicles ovoid or pyramidal, rather lax and open, 6-12 cm. long, one half to three fourths as wide, the axis slightly scaberulous, the scabrous branches and branchlets tending to be divaricately spreading, the lateral pedicels shorter than the usually purple spikelets; glumes a little unequal, broad, narrowed into a short awn, glabrous, the first, including awn, about 1.5 mm. long; lemma acuminate, densely short-pilose on the callus, scaberulous toward tip, 2.5-3 mm. long, narrowed into a slender flexuous awn about 5-10 mm. long; palea narrow, about as long as the lemma pilose on the lower part of the back.
Type locality: Alamosa. Sonora (Palmer 407 in 1890). Distribution: Mossy cliffs and wet ravines, Sonora to Morelos.