Bouteloua trifida var. burkii
Panicle branches ascending to divergent, rarely appressed. Lower glumes 1.7-3.1 mm, veins excurrent for 0.05-0.2 mm, usually not exceeding the apical lobes; upper glumes 1.9-3.2 mm, veins excurrent for 0.05-0.2 mm, usually not exceeding the apical teeth; lower lemmas conspicuously appressed-pubescent across the lower 2/3 - 4/5 and along most or all of the margins, awns 2.2-4.5 mm; anthers 0.2-0.3 mm. Caryopses 0.8-1.2 mm long, 0.5-0.6 mm wide, flat or slightly concave adaxially. 2n = 20.
Bouteloua trifida var. burkii grows in southern New Mexico, southern Texas, and adjacent Mexico.
"decumbent" is not a number.