Bouteloua mexicana (Scribn.) Columbus

Fourniera mexicana Scribn. Bull. U. S. Dep. Agr
Agrost. 4 : 8. 1897.
Stems rooting at the lower nodes and there forming tufts of erect or ascending branches Tip to 3 dm. tall; leaf-sheaths smooth; blades up to 8 cm. long and 2 mm. wide, somewhat rough beneath, glabrous or sparingly pubescent on the upper surface; spikes terminal and axillary, sometimes 3 or 4 from the uppermost leaf-sheath, 1.5-3 cm. long, bearing 3-15 spikelets; staminate spikelets 4-5 mm. long, the 2 empty scales at the base of the first flowering -scale about 1 mm. long, the third empty scale broader and about 2 mm. long, the first flowering scale 3 mm. long, thin-membranous, glabrous, entire or indistinctly 3-toothed at the apex, the second flowering scale about 4 mm. long, including the short awn, glabrous; pistillate spikelets about 4 mm. long, excluding the awns, the 3 awns of the prolongation of the glabrous rachilla 6-8 mm. long, ciliate on the margins, the empty scales 2-3 mm. long, scabrous, densely pilose at the base, the flowering scale 3 mm. long.