Plants cespitose, open and ovate to obpyramidal above. Culms 1.1-3.1
m; internodes not glaucous; branches arching. Sheaths smooth;
ligules 0.2-0.5 mm, ciliate, cilia 0.6-1.5 mm; blades 21-54 cm long,
2.3-6 mm wide, glabrous or sparsely pubescent, with spreading hairs. Inflorescence
units 12-190 per culm; subtending sheaths (2.1)2.4-3.5(4.1) cm long,
(2.3)2.6-3(3.8) mm wide; peduncles (13)20-31(43) mm, with 2(3) rames; rames
(1.2)1.5-2.1(2.6) cm, usually exserted at maturity, pubescence increasing in density
distally within each internode. Sessile spikelets (4.1)4.4-4.6(5) mm; callus
hairs 1-1.5 mm; keels of lower glumes scabrous only above the midpoint;
awns 2-11 mm; anthers 1, 1.4-2.4 mm, red. Pedicellate spikelets
vestigial or absent. 2n = 20.
Andropogon brachystachyus grows in sandy, often seasonally wet soils
of flatwoods, savannahs, pond margins, and scrublands of the southeastern United
States. It sometimes forms large populations, but does not invade disturbed
sites as do some morphologically similar forms of A.
virginicus var. virginicus.