Bouteloua scorpioides Lag.

Bouteloua scorpioides Lag. Gen. & Sp. Nov. 5. 1816
Actinochloa? scorpioides R. & S. Syst. Veg. 2: 420. 1817. (Based on Bouleloua scorpioides Lag.) Atheropogon scorpioides Spreng. Syst. I: 293. 1825. (Based on Bouteloua scorpioides Lag.) Chondrosium? scorpioides Kunth. R^v. Gram. 94. 1829. (Based on Bouteloua scorpioides Lag.) ^Erucaria monostachia Cerv. Naturaleza 1: 349. 1870.
Perennial; culms in small dense clumps, erect, 10-30 cm. tall, glabrous; sheaths glabrous, overlapping, usually with a conspicuous tuft of hairs at the throat; ligule ciliate, about 0.5 mm. long; blades involute, filiform, recurved or flexuous, glabrous; spike solitary, suberect to spreading, straight to arcuate, as much as 5 cm. long; spikelets pectinate, crowded; glumes subacute, glabrous, the first narrow, 2-3 mm. long, the second broader, 4-7 mm. long; fertile lemma 4-5 mm. long, bearded at the base, densely pilose on the margins and both sides of the midnerves in the lower half, the awns stout, somewhat flattened, the lateral ones (including (he narrow lobes) about 2 mm. long, the central one about 1.5 mm. long; rudiment bearded at the base, the awns 4-4.5 mm. long, the intermediate lobes small, obtuse.
Type locality: Mexico.
Distribution: Rocky hills and plains, central Mexico.