Plants perennial; cespitose, with innovations, without rhizomes. Culms
75-100 cm, erect, glabrous. Sheaths hirtellous on the margins when immature,
apices glabrous or hairy shorter than 0.5 mm; ligules 0.2-0.3 mm; blades
20-40 cm long, 2-5(6) mm wide, flat to involute, glabrous abaxially, scabrous
adaxially. Panicles 22-40 cm long, 0.3-0.6 cm wide, spikelike, dense; primary
branches shorter than 1.2 cm, closely appressed, spikelet-bearing to the base;
pulvini glabrous; pedicels 0.1-0.6 mm, mostly appressed, hirtellous.
Spikelets 1.4-2.2 mm long, 0.9-1.2 mm wide, ovate, stramineous to light
greenish, with 2-3 florets; disarticulation basipetal, in the rachilla
below the individual florets or at the base of the florets, glumes persistent.
Glumes elliptic to ovate, hyaline, keels ciliolate; lower glumes
0.7-1 mm; upper glumes 0.9-1.3 mm, apices obtuse; lemmas 1.5-2.1
mm, ovate, membranous to hyaline, apices acute to obtuse; paleas 1.1-1.6
mm, hyaline, not wider than the lemmas, apices obtuse; anthers 2, 0.3-0.4
mm, reddish-brown. Caryopses 0.7-1 mm, ellipsoid, somewhat ventrally flattened,
smooth to faintly striate, reddish-brown. 2n
grows in moist areas in prairies, usually in deep,
sandy, clay loam soils, at 0-70 m. It is native from southern Texas to Mexico
and in Paraguay and Argentina. In North America, it grows with Andropogon, Quercus stellata, Prosopsis glandulosa, and Acacia.