Plants cespitose or somewhat rhizomatous, upper portion dense, oblong to
ovate. Culms 90-170 cm; internodes occasionally somewhat glaucous
just below the nodes; branches straight, erect to ascending. Sheaths
smooth, rarely somewhat scabrous; ligules 0.3-0.9 mm, sometimes ciliate,
cilia to 0.5 mm; blades 15-35 cm long, 3-8 mm wide, glabrous or densely
pubescent, hairs spreading. Inflorescence units 5-45 per culm; subtending
sheaths (3.3)3.8-6.8(9) cm long, (2.5)3.2-4(5) mm wide; peduncles (9)26-66(115)
mm, with 2(4) rames; rames (2.2)2.6-4.3(5.3) cm, usually exserted at maturity,
pubescence either evenly distributed or more dense distally within each internode.
Sessile spikelets (4.3)4.9-5.4(6.1) mm; callus hairs 1.5-2.5 mm;
keels of lower glumes scabrous from below the midpoint; awns 5-16
mm; anthers 1(3), 2-3.5 mm, red. Pedicellate spikelets vestigial
or absent. 2n = 20.
Andropogon arctatus grows in flatwoods, bogs, and scrublands of southern
Alabama and Florida. Its flowering appears to be stimulated by fire but, unlike
other members of sect. Leptopogon in the
Flora region, the effect lasts only one or two years, the plants then remaining
vegetative until the next fire occurs. It is similar to A.
ternarius, but differs in its long, usually solitary anther and shorter