Panicum laxiflorum Lam.

Panicum xalapense H. B. K. Nov. Gen. & Sp. 1: 103. 1815
Panicum pumilum Bosc; Nees, Agrost, Bras. 228, as synonym. 1829. Not P. pumilum Lam. 1798.
Panicum rariflorum RuDr. ; Galeotti, Bull. Acad. Brux. 9 2 : 240, hyponym. 1842. Not P. rariflorum
Lam. 1798. Panicum Ruprechti Fourn. Mex. PI. Gram. 21. 1886. Not P. Ruprechtii Fenzl, 1854. Panicum caricifolium Scribn.; Ashe, Jour. Elisha Mitchell Soc. 15: 57, as synonym. 1898. Panicum xalapense strictirameum Hitchc. & Chase, Contr. U. S. Nat. Herb. 15: 161. 1910.
Vernal phase similar to P. laxiflorum in texture and habit ; culms and leaf -blades on the average shorter, the blades pilose on one or both surfaces or nearly glabrous, usually short-ciliate, the uppermost more or less convolute at base around the culm; panicles hardly so few-flowered; spikelets 1.9-2 mm. long, 1.1 mm. wide, oblong-obovate, obtuse, the first glume one fourth to one third as long as the spikelet ; second glume and sterile lemma pilose, less prominently papillose, the glume shorter than the fruit, the latter 1.5 mm. long and 1 mm. wide, oval, minutely umbonate.
Autumnal phase as in P. laxiflorum, but forming usually denser tufts with shorter leaves.
Type locality: Jalapa, Vera Cruz.
Distribution: Maryland to Missouri, and south to Florida. Texas, and Guatemala; Hispaniola.

Perennials, Terrestrial, not aquatic, Rhizomes present, Stems nodes swollen or brittle, Stems mat or turf forming, 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, or scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves conspicuously 2-ranked, distichous, Leaf tips flexuous, drooping, blades thin, lax, soft, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath hairy, hispid or prickly, Leaf sheath hairy at summit, thro at, or collar, Leaf sheath and blade differentiated, Leaf blades lanceolate, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, 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 dorsally compressed or terete, Inflorescence or spikelets partially hidden in leaf sheaths, subtended by spatheole, Spikelet less than 3 mm wide, Spikelets with 1 fertile floret, Spikelets with 2 florets, Spikelets solitary at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating below the glumes, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes distinctly unequal, 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 coriaceous, firmer or thicker in texture than the glumes, Lemma becoming indurate, enclosing palea and caryopsis, Lemma 3 nerved, Lemma 5-7 nerved, Lemma 8-15 nerved, Lemma glabrous, Lemma apex truncate, rounded, or obtuse, Lemma awnless, Lemma margins inrolled, tightly covering palea and caryopsis, Lemma straight, Palea present, well developed, Palea about equal to lemma, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis.

Panicum laxiflorum adalah spesies tumbuhan yang tergolong ke dalam famili Poaceae. Spesies ini juga merupakan bagian dari ordo Poales. Spesies Panicum laxiflorum sendiri merupakan bagian dari genus Panicum. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh Lam..

Panicum laxiflorum là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Lam. mô tả khoa học đầu tiên năm 1798.