Annual Muhly

Sporobolus microspermus (Lag.) Hitchc. Jour. Wash. Acad 23:453. 1933.
Milium micros permum Lag. Gen. & Sp. Nov. 2. 1816.
Agrostis minutissima Steud. Syn. Gram. 171. 1854. (Type from New Mexico, Fendler 986.)
Vilfa confusa Fourn. Mex. PI. Gram. 101. 1886. (Type from Mexico; Hall &* Harbour 643 from
the United States also cited by Fournier.) Sporobolus confusus Vasey, Bull. Torrey Club 15: 293. 1888. (Based on Vilfa confusa Fourn.) Sporobolus confusus var. aberrans Jones, Contr. W. Bot. 14: 10. 1912. (Specimens cited from
Bowie, Arizona, and Juarez, Mexico.) Sporobolus minutissimus Hitchc. Proc. Biol. Soc. Wash. 41: 161. 1928. (Based on Agrostis minutissima Steud.)
Annual; culms erect or spreading, branched below, slender, puberulous or scaberulous, 10-30 cm. tall; sheaths striate, scaberulous; ligule thin, pointed, 1-2 mm. long; blades flat, lax, scaberulous, mostly less than 10 cm. long, 1-2 mm. wide; panicles oblong, open, half or two thirds as long as the entire culm, the axis glabrous below, scaberulous above, the branches spreading, scabrous, glabrous in the axils, the pedicels slender, spreading, thickened below the spikelets; spikelets 1-1.8 mm. long; glumes obtuse, about equal, half to three fourths as long as the spikelet or a little more, distinctly or obscurely pilose; lemmas obtuse, pubescent on midnerve and margins.
Type locality: Mexico (grown in Spain from seed sent by Sesse).
Distribution: Sandy or rocky open ground, Montana and eastern Washington to Nebraska, Texas, New Mexico, and southern California; Costa Rica.