Limnodea arkansana (Nutt.) L. H. Dewey

Limnodea arkansana (Nutt.) L. Dewey, Contr. U. S. Nat Herb. 2:518. 1894.
Greenia arkansana Nutt. Trans. Am. Phil. Soc. II. 5: 142. 1837.
Sclerachne arkansana Torr.; Trin. Mem. Acad. St.-Petersb. VI. 6 2 : 274. 1841. (Based on Greenia
arkansana Nutt.) Sclerachne pilosa Trin. Mem. Acad. St.-Petersb. VI. 6 2 : 275. 1841. (Type from Texas.) Limnas arkansana Trin.; Steud. Nom. Bot. ed. 2. 2: 45. 1841. (Based on Greenia arkansana Nutt.) Stipa detnissa Steud. Syn. Gram. 131. 1854. (Type from New Orleans, Drummond 465.) Muhlenbergia hirtula Steud. Syn. Gram. 180. 1854. (Type from Texas.) Limnas pilosa Steud. Syn. Gram. 421. 1855. (Based on Sclerachne pilosa Trin.) Thurberia arkansana Benth.; Vasey, Grasses U. S. 16. 1883. (Based on Greenia arkansana Nutt.) Thurberia pilosa Vasey, Grasses U. S. 16. 1883. (Based on Sclerachne pilosa Trin.) Limnodia arkansana pilosa Scribn. Bull. U. S. Dep. Agr. Agrost. 7: ed. 3. 139. 1900. (Based on
Sclerachne pilosa Trin.)
Culms branching at base, glabrous, mostly 3or 4-noded, 20-40 cm. tall; sheaths glabrous or slightly roughened, sometimes sparsely pilose; ligule thin, dentate or lacerate, 1-2 mm. long; blades more or less pubescent or pilose on both surfaces, mostly 5-10 cm. long and 2-4 mm. wide; panicles narrow but loose, 5-15 cm. long; spikelets 3.5-4 mm. long; glumes scabrous, hispidulous or pilose; lemma about as long as the glumes, the awn 8-10 mm. long.
Type locality: Red River, Arkansas.
Distribution: Dry soil, prairies and river banks. Coastal Plain, Florida to Texas, Arkansas, and Oklahoma.

Annuals, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems, culms, o r scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath hairy, hispid or prickly, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades more or less hairy, Ligule present, Ligule an unfringed eciliate membrane, Ligule a fringed, ciliate, or lobed membrane, Inflorescence terminal, Inflorescence an open panicle, openly paniculate, branches spreading, Inflorescence a contracted panicle, narrowly paniculate, branches appressed or ascending, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence branches more than 10 to numerous, Flowers bisexual, Spikelets pedicellate, Spikelets laterally compressed, Spikelet less than 3 mm wide, Spikelets with 1 fertile floret, Spikelets solitary at rachis nodes, Spike lets all alike and fertille, Spikelets bisexual, Spikelets disarticulating below the glumes, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes equal to or longer than adjacent lemma, Glume equal to or longer than spikelet, Glumes 3 nerved, Glumes 4-7 nerved, Lemma similar in texture to glumes, Lemma 3 nerved, Lemma glabrous, Lemma apex dentate, 2-fid, Lemma distinctly awned, more than 2-3 mm, Lemma with 1 awn, Lemma awn less than 1 cm long, Lemma awn 1-2 cm long, Lemma awn subapical or dorsal, Lemma awn twisted, spirally coiled at base, like a corkscrew, Lemma awn once geniculate, bent once, Lemma margins thin, lying flat, Lemma margins inrolled, tightly covering palea and caryopsis, Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea shorter than lemma, Palea 2 nerved or 2 keeled, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis.

Limnodea es un género monotípico de plantas herbáceas de la familia de las poáceas.​ Su única especie: Limnodea arkansana (Nutt.) L.H.Dewey, es originaria del sur de los Estados Unidos.

Limnodea arkansana là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Nutt.) Dewey mô tả khoa học đầu tiên năm 1894.