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.