Trisetum pringlei (Scribn. ex Beal) Hitchc.

Trisetum pringlei (Sciibn.) Hitchc. Proc. Biol. Soc. Wash 40:82. 1927.
Craphephorum Pringlei Scribn.; Beal, Grasses N. Am. 2: 561. 1896.
Perennial; culms tufted, slender, erect, glabrous, 2-noded, the lower node near the base, 25-50 cm. tall; upper sheath glabrous, the lower more or less pubescent, sometimes densely so; ligiUe truncate, rather firm, scaberulous, minutely ciliate; blades mostly basal, one about the middle of the culm, flat, folded, or loosely involute, more or less pubescent or pilose, stiffish and sharp-pointed, mostly not more than 10 cm. long, 1-2 mm. wide; panicle lax, open, nodding. 5-15 cm. long, the axis smooth, slender, the branches capillary, flexuous, in distant whorls of 2 or 3, spreading or drooping, as much as 5 cm. long, spikelet-bearing above the middle, usually with 1 or 2 short branches at base; spikelets usually purple, about 5 mm. long, 2-flowered, rather slender or narrow, the slender rachilla about 1.5 mm. long, villous; glumes unequal, scabrous on the keels, the first narrow, 2-2.5 mm. long, the second wider, 3 mm. long; lemmas narrow, rounded on the back, scabrous-pubescent, awnless, the first about 3.5 mm. long.
Type locality: Summit of Sierra de San Felipe, Oaxaca {Pringle 4765). Distribution: Southern Mexico to Panama.