Trisetum virletii E. Fourn.

Trisetum virletii Kourn. Mex. PI. Gram. 108. 1886
Trisetum bambuiiforme Fourn. Mex. PI. Gram. 108. 1886. (Type from Valley of Mexico, Bourgeau 1304.)
Perennial; culms stout, many-noded, as much as 7 mm. thick near base, 1-2 meters tall, glabrous or scaberulous, often bearing fascicled short branches at the nodes; sheaths .scaberulous, the lower bladeless; ligule rounded, dentate, scaberulous, as much as 5 mm. long; blades flat, very scabrous, sometimes sparsely pilose on the upper surface, elongate, as much as 1 cm. wide, tapering to a long fine point ; panicle large, many-flowered, rather dense but spreading, 15-30 cm. long, 10-15 cm. wide, the capillary branches scabrous, numerous in fascicles, naked below, as much as 12 cm. long, branching; spikelets 3-flowered or 4-flowered, sometimes 2-flowered, 5-S mm. long, the hairs of the rachilla 2 mm. long, the callus-hairs short; glumes scabrous on the keels and nerves, the first 3-4 mm. long, l-nersxd, the second longer and broader, 3-ner-ed; lemmas scabrous, acute, about 5 mm. long, the nerves rather faint, scarcely excurrent; a^vn attached about 2 mm. below the scarcely bifid tip, spreading, exserted, scabrous.
Type LOCALirv: San Luis Potosi (,Virlel 1384).
Distribution: Open woods and cool mountain sloi^es, altitude 2000-3000 meters, San Luis Potosi to southern Mexico.