Muhlenbergia annua (Vasey) Swallen

Sporobolus annuus Vasey, Bull. Torrey Club 14: 9. 1887
Annual; culms erect or somewhat spreading, branched at base, glabrous, 10-15 cm. tall; sheaths glabrous, keeled; ligule about 2 mm. long; blades flat or folded, glabrous, 1-3 cm. long, 1 mm. wide, the midrib thickened; panicles oblong or ovoid, open, about half the entire height of culm, the axis glabrous, the branches ascending, scaberulous, the axils glabrous, the pedicels capillary, thickened below the spikelet; glumes equal, glabrous, abruptly sharp-pointed, 1.51.7 mm. long; lemma a little shorter than the glumes, appressed-pubescent.
Type locality: Noragachi, Chihuahua {Palmer 4a in 188.5). Distribution: Sandy soil near water; known only from the type locality.