Plants cespitose, often with a knotty base, not or shortly rhizomatous.
Culms in large or small clumps, stiffly erect. Blades usually
narrow, but at least some over 2.5 mm wide. Panicles with 12-80 branches,
averaging 2-7 spikelets per branch. Glumes and lemmas bronze
or stramineous to green, or various shades of purple; anthers usually
yellow or orange, occasionally red or purple. 2n = 58-103.
Bouteloua curtipendula var. caespitosa grows on loose, sandy
or rocky, well drained limestone soils at 200-2500 m in the southwestern United
States, Mexico, and South America. It frequently grows, and may hybridize, with