Plants perennial; rhizomatous. Culms 25-100 cm, erect. Leavesbasal
and cauline; sheaths glabrous, margins scarious, sparsely ciliate distally;
ligules 0.5-1 mm, of hairs; blades flat to conduplicate, glabrous
or scabrous. Panicles 10-30 cm; branches 5-15, 1-3.7 cm, erect,
with more than 12 spikelets; terminal bristles 2.5-4 mm. Spikelets
2.2-3.2 mm, clearly overlapping. Lower glumes 0.8-1.2 mm, 1-3-veined, truncate;
upper glumes and lower lemmas 2-2.4 mm, glabrous, 5-7-veined, acuminate;
lower paleas 2-2.4 mm, scarious; upper lemmas and paleas
2-2.3 mm, rugose, stramineous to light brown, lemma margins scarious, inrolled,
clasping the paleas, lemma apices acuminate; anthers 1.2-1.5 mm. Caryopses
about 1 mm in diameter, spheroidal, slightly flattened, yellow. 2n = 18,
54.
Paspalidium geminatum grows in moist to wet, fresh to brackish areas. It
is native to southeastern North America, the West Indies, and tropical regions
of the Americas.
