Plants perennial; rhizomatous. Culms to 2.5 m. Sheaths glabrate,
mostly glabrous at maturity, with tufts of hairs near the collar; collars
ciliate to pubescent; blades to 67 cm long, about 1 cm wide. Panicles
27-67 cm, open; branches drooping or nodding at maturity. Spikelets
15-30(50) mm long, 6-16 mm wide, ovate-elliptical, with (3)5-34 florets, the lower
(3)4-5(8) sterile. Glumes 5-12 mm, acute; lemmas essentially glabrous,
(7)9(13)-veined; paleas present only in the functional florets; anthers
4-6 mm. Caryopses 3-5 mm long, 1-1.5 mm wide. 2n = 40.
Uniola paniculata grows on the beaches and sand dunes of the Atlantic and
Gulf coastal plains from Maryland to Veracruz, Mexico, and on the Florida Keys,
the Bahama Islands, and Cuba. Seed production is generally poor; the reason is
Stout, 1-2.5 m, from extensively creeping rhizomes; lf-blades 2-4 dm, mostly under 1 cm wide, broad-based, ±involute, attenuate into a long slender tip; infl 2-6 dm, rather crowded, or more open in age; spikelets ascending on stout pedicels, ovate or lance-ovate, 15-40 mm, 10-25-fld; glumes and the 3-5 sterile lemmas lance-linear, scarcely shorter than the lower fertile lemmas; lemmas lance-ovate, smooth or scaberulous on the keel, about equaling the palea; 2n=40. Coastal sands; se. Va. to Fla., Tex., Mex., and W.I.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.