Phanopyrum gymnocarpon (aka Panicum gymnocarpon) (SAVANNAH PANICGRASS) is a native perennial graminoid. It is a wetland plant with stolons (lower portion rooting at the nodes). Leaves cauline; blades flat, elongate, and with a cordate base. Inflorescence a panicle of spreading to ascending rame like branches. The spikelets are remotely spaced along the branches and naked toward the base hence the name gymnocarpon. Spikelets 2-floreted (upper floret perfect, lower floret neuter or staminate), dorsally compressed, disarticulating below the glumes, nearly sessile, appressed to the rachis. 1st glume nearly as long as the sterile lemma, acuminate, 3-nerved,; 2nd glume and sterile lemma membranous, subequal; 2nd glume acuminate, 5-nerved, 5.5-7 mm long, glabrous to scabrous, margins scarious; sterile lemma acuminate, 4.5-6 mm long, 5-nerved, glabrous or sparsely scabrous apically; sterile palea scarious, 2-3.5 mm long, margins ciliate; fertile lemma and palea indurate, brown, lustrous, acute, 2-2.2 mm long, fertile lemma margins, inrolled, clasping the palea; fertile palea margins inrolled, clasping the caryopsis; caryopsis purple, obovoid, 1.5-1.9 mm long. No caterpillar use reported for this species but seven skippers and two moth species are reported to use the genus Panicum. Reported from 59 parishes in the state and missing only from Bienville, Plaquemines, Sabine, St. Bernard, and St. James parishes.