Culm stout 2-4 feet high, smooth. Sheaths smooth, stronger than the internode, Leaves very minute, acute, Leaves flat or involute 6"-1 foot long, 2-3 lines broad at base alternate at the tip. Scabrous on the margins. Pilose with a few long hairs on the upper surface near the base. Panicle 8"-1 foot long, rays solitary or several irregularly inserted 2"-2½" long, spreading ¼ naked, or glumiform to the base; glabrous throughout. Pedicels shorter than the Spikelet. Spikelet ⅛" long brownish, smooth. Lower glumes almost in the length. The upper 1/3 longer or nearly equaling the palea, 1-nerved to ¼ shorter or nearly equaling the palea, 2-nerved. Lower palea acute, strongly 1-nerved, the upper usually somewhat longer, acuminately 2-nerved - often split, Seed brown, the cortex very delicate & not very readily separating. No. 1979 + 1976 Wright; Cortez Spring, Breyelov, ("Presidio del Norte" Parry; "Río Bravo del Norte" Schott & "Cienega Grande" Gregg are probably just young stages of the same.) To be compared with L. Schiedeman's Triu This belongs to Spor. cryptandra, var. glabior - page 52.