Bouteloua reflexa Swallen

Bouteloua reflexa Swallen, sp. nov
Perennial; culms in large clumps, erect from a rather hard rhizomatous base, about 1 meter tall, glabrous; sheaths overlapping, glabrous; ligule membranaceous, about 0.2 mm. long; blades flat, attenuate, 15-25 cm. long, 3-4 mm. wide, scabrous, papillose-hispid on the upper surface near the base, the margins rather finely scabrous; inflorescence terminal and axillary; spikes mostly 40-50 on a common axis, 15-25 cm. long, falling entire, the upper ones approximate, spreading, about 5 mm. long, progressively longer and more distant downward, the lower ones as much as 1.5 cm. long, not more than 2 mm. wide, reflexed; spikelcts appressed, not crowded; first glume narrow, acuminate, scabrous on the keel, 2-2.5 mm. long; second glume broader, subacuminate, awn-pointed, 3-3.5 mm. long, scabrous on the keel, otherwise glabrous; lemma 3.5-4 mm. long, glabrous, or sparsely appressed-pilose on the upper half, 3-Iobed, the middle lobe broad, minutely bifid, the awn 0.5 mm. long, the lateral lobes very narrow, awnlike, about 1 mm. long; rachilla prolonged beyond the fertile floret as a naked stipe about 1 mm. long, the rudiment obsolete or sometimes developed as a single awn about as long as the fertile floret.
Perennis; culmi dense caespitosi, erecti circa 1 meter alti, glabri; vaginae intemodiis longiores, glabrae; ligula membranacea, 0.2 mm. longa; laminae 15-25 cm. longae, 3-4 mm. latae, planae, attenuatae, scabrae, supra ad basin papilloso-hispidae, marginibus scabris; inflorescentiae terminales et axillares, 15-25 cm. longae; spicae 40-50, deciduae, 0.5-1.5 cm. longae, ad 2 mm. latae, divergentes vel reflexae; spiculae appressae vix densae; gluma prima 2-2.5 mm. longa, angusta, acuminata ad carinam scabra; gluma secunda 3-3.5 mm. longa, latior, subacuminata, mucronata, ad carinam scabra; lemma 3.5-4 mm. longum, glabrum vel sparse pilosura, 3-lobatum, lobo medio minute bifido, arista 0.5 mm. longa, lobis lateralibus angustis, 1 mm. longis; flosculus imperfectus obsoletus.
Type collected on mountain sides near Lodiego, Sonora, October 9-15, 1891, Palmer 1655 (U. S. Nat. Herb. no. 471374).
Distribution : Known only from the type locality.