Plants perennial; cespitose, with innovations, without rhizomes, not glandular.
Culms 85-130(150) cm, stiffly erect, glabrous below the nodes. Sheaths
glabrous or hairy at the apices, hairs to 4 mm; ligules 0.1-0.2 mm; blades
25-50 cm long, 1.5-6 mm wide, flat to involute, glabrous abaxially, scabridulous
adaxially, sometimes also with a few scattered hairs near the base. Panicles
(10)20-50(60) cm long, 2-8(10) cm wide, narrowly ovate, contracted to open; primary
branches mostly 2-14 cm, appressed or diverging up to 50° (90° ) from
the rachises, spikelets congested near the base of the branches; pulvini
glabrous; pedicels 0.3-2.4 mm, appressed, always shorterthan the spikelets.
Spikelets 3.2-10(12) mm long, 0.7-1.4 mm wide, linear-lanceolate, stramineous
to plumbeous, sometimes with a reddish tinge, with (5)8-25 florets; disarticulation acropetal,
glumes first, then the lemmas, paleas persistent. Glumes subequal, ovate
to lanceolate, hyaline; lower glumes 1-1.5 mm; upper glumes 1.1-1.6
mm; lemmas 1.1-1.8(2) mm, ovate, membranous, apices acute; paleas
0.8-1.7 mm, hyaline, narrower than the lemmas, apices obtuse to truncate; anthers
2, 0.2-0.3 mm, purplish. Caryopses 0.6-0.9 mm, ovoid, flattened ventrally,
finely striate, reddish-brown. 2n
grows on beaches, in brackish water, and along roadsides,
at elevations below 5 m in Florida. Its range extends southward from Florida through
Mexico and Central America to Colombia.