Plants perennial; cespitose, with innovations, without rhizomes, not glandular.
Culms (60)75-130 cm, erect. Sheaths glabrous, apices hairy, hairs
to 4 mm; ligules 0.1-0.3 mm; blades (5)8-20 cm long, (1)2-3(4) mm
wide, flat to involute, abaxial surfaces glabrous, adaxial surfaces mostly scabridulous,
long ciliate basally. Panicles (7)10-20(28) cm long, (2.5)4-15 cm wide,
ovate, open; primary branches (3)5-10(13) cm, diverging 20-60° from
the rachises, wiry, somewhat capillary, naked basally; pulvini glabrous
or sparingly hairy, hairs shorter than 2 mm; pedicels 1-10 mm, appressed,
scabridulous. Spikelets 5-10(19) mm long, 1.4-2.4 mm wide, ovate-lanceolate,
plumbeous to purplish, with 10-22 florets; disarticulation acropetal, glumes
first, then the florets. Glumes subequal, lanceolate to ovate, membranous;
lower glumes 1.2-1.4 mm, narrower than the upper glumes; upper glumes
1.4-1.7 mm; lemmas (1.5)1.7-2 mm, broadly ovate, leathery, keels scabridulous,
lateral veins evident, apices acute; paleas 1.4-1.9 mm, hyaline, bases
not projecting beyond the lemmas, keels scabridulous, apices acute to obtuse;
anthers 3, 0.7-0.9 mm, reddish-purple. Caryopses 0.6-0.9 mm, obovoid
to ellipsoid, terete, opaque, somewhat striate, reddish-brown. 2n = 60.
Eragrostis atrovirens is native to northern Africa, but it is now established
in southeastern United States, where it grows along railways and roads, on beaches
and in ditches, often in wet sandy soils and in association with Pinus,
Taxodium, and Sabal.