Andropogon pringlei Scribn. & Merr.

Andropogon pringlei Scribn. & Merr. Bull. U. S. Dep. Agr
Agrost. 24 : 7. 1901.
A tufted perennial, with erect sparingly branched stems, short leaf-blades, and lax racemes. Stems about 1 m. tall, glabrous; leaf-sheaths shorter than the internodes, glabrous, the upper ones inflated; blades narrow, those on the innovations linear, 8-12 cm. long, 1-2 mm. wide, usually more or less hirsute on the upper surface, those on the stem shorter and broader, 2-6 cm. long, 3-4 mm. wide, linear-lanceolate; racemes in 2*s-4's, subdigitate, the rachis somewhat flexuous, the internodes and pedicels pubescent with long white hairs; sessile spikelet linearlanceolate, 6-8 mm. long, about twice as long as the internodes, the first scale 2-toothed at the apex, hispidulous on the keels, the intercarinal space flat or nearly so, the second scale keeled, the fourth scale deeply 2-cleft at the apex and bearing a perfect awn 1-1.5 cm. long; pedicellate spikelet about 5 mm. long, reduced to 1 or 2 purplish narrow scales.
Type locality : Valley of Mexico, Federal District. Distribution : Known only from the type locality.