Schizachyrium spadiceum

Plants cespitose. Culms 60-95 cm, slender, erect, glabrous. Leaves glaucous; sheaths compressed, scabridulous, glabrous or almost so; ligules 1-1.5 mm, truncate, erose-ciliate; blades 10-25 cm long, 2-2.5 mm wide, flat, scabrous, young blades ciliate basally. Peduncles 5-9 cm, mostly erect, often included in the subtending leaves, with 2 rames; rames 3.5-5 cm, enclosed or exerted at maturity; internodes 4-6.3 mm, ciliate proximally, densely villous on the distal 1/2-2/3, hairs 4-7 mm. Sessile spikelets 7-8 mm; calluses 0.2-0.5 mm, hairs 1-2 mm; lower glumes glabrous, keels scabridulous distally; awns 14.5-17.5 mm, once-geniculate. Pedicels 5-6 mm, hairs 5-7 mm. Pedicellate spikelets 0.8-4 mm, sterile, unawned. 2n = unknown.

Schizachyrium spadiceum was once thought to be a Mexican endemic, but it is now known from limestone slopes in Brewster County, Texas.