Bouteloua trifida var. trifida
Panicle branches appressed to ascending, occasionally divergent. Lower glumes 2.2-3.4 mm, midveins excurrent for 0.1-0.6 mm; upper glumes 2.7-4 mm, midveins excurrent for 0.2-1 mm; lower lemmas glabrous or sparsely appressed-pubescent along both sides of the veins, awns (3.2) 4-6.6 mm; anthers 0.3-0.4 mm. Caryopses 1.3-1.5 mm long, 0.4-0.5 mm wide, grooved adaxially. 2n = unknown.
Utah, Calif., Ariz., Nev., N.Mex., Tex.
Bouteloua trifida var. trifida grows in dry plains and rocky slopes, mostly at 300-1500 m, from southern California, Nevada, and Utah to Texas and Mexico.
"decumbent" is not a number.