Setaria geminata var. paludivaga (Hitchc. & Chase) R. D. Webster

Perennial, with creeping or floating ± spongy rhizomes; culms 10-60 cm high, prostrate and rooting at the lower nodes. Leaf-blades 5-30 cm long, 2-10 mm wide, flat or folded, setaceously acuminate. Inflorescence 5-30 cm long; racemes 0.54 cm long, usually less than their own length apart, their rhachis narrowly winged from a triquetrous midrib, 0.5-1 mm wide, glabrous or sparsely ciliate. Spikelets ovate, 1.6-2.6(2.9) mm long; lower glume truncate, a quarter to a third the length of the spikelet; upper glume two-thirds to four-fifths the length of the spikelet; lower floret with a palea, its lemma as long as the spikelet, the nerves not raised; upper lemma granulose.

Distribution: Pakistan (Sind): Old World tropics.

Fl. & Fr. Per.: mostly October-January, but sometimes as early as August or as late as March.

Panicum paludivagum Hitchc. & Chase, Contr. U. S. Nat. Herb
15: 32. 1910.
Plants glabrous throughout; culms elongate, from a. long, creeping base, rooting at the nodes, rather soft and succulent, as much as 2 meters long, the lower submerged portion loosely branching, the intern odes, except the uppermost, somewhat swollen, the nodes constricted and often dark-colored; leaf-sheaths papery and more or less inflated, especially the lower, mostly deciduous from the submerged portion; ligule ciliate, about 1 mm. long; blades 15-40 cm. long, conduplicate at base, flat above, longacuminate, rather lax, very scabrous on the upper surface, smooth below, the lower much reduced or rudimentary; panicles usually overtopped or equaled by the leaves, 25-35 cm. long; axis angled, smooth; racemes 12-15, erect, the lower distant, 3 cm. long, the upper gradually approximate and shorter, the axis ending in a rudimentary spikelet or sometimes in a short, slender-pointed prolongation; spikelets appressed to the angled rachis, 2.8-3 mm. long, 1.4-1.6 mm. wide, narrowly ovate, not turgid, subacute; first glume about one fifth the length of the spikelet, nerveless, erosetruncate; second glume half to two thirds the length of the spikelet, faintly 3-nerved; sterile lemma as long as the fruit, very faintly nerved toward the summit, inclosing a palea of equal length and a staminate flower; fruit 2.8-3 mm. long, 1.2-1.3 mm. wide, narrowly ovate, acute, very obscurely rugose, the margins scarcely inrolled.
Type locality : Eustis, Florida.
Distribution : Florida, Texas, Mexico, and Central America ; also in Uruguay.

Paspalidium geminatum là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Forssk.) Stapf mô tả khoa học đầu tiên năm 1920.