Panicum linearifolium Scribn.

Panicum perlongum Nash, Bull. Torrey Club 26: 575. 1899
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Panicum Pammeli Ashe, Bull. N. Car. Exp. Sta. 175: 116. 1900.
Vernal phase similar to that of P. depauperatum, more strict in habit, and in smaller tufts, more constantly pilose and usually papillose, the blades on the average longer and narrower, 245
sometimes 25 cm. long, pubescent on the lower surface; panicles smaller and narrower, the branches erect, hence appearing more densely flowered; spikelets 2.7-3.2 mm. long, 1.6-1.7 mm. wide, oval, blunt, sparingly pilose; first glume one fourth to one third the length of the spikelet, acute or obtuse ; second glume and sterile lemma equal, obtuse, not extending beyond the fruit, strongly 7-9-nerved; fruit 2.4 mm. long, 1.5-1.6 mm. wide, obovate-oval, rounded and minutely umbonate at the summit.
Autumnal phase with secondary panicles usually more numerous than in P. depauperatum and sometimes produced from the second node.
Type locality: Oklahoma.
Distribution: Manitoba to Texas.

Panicum linearif olium Scribn. ; Nash, in Britt. & Brown,
111. Fl. 3: 500. 1898.
Vernal phase light-green, in dense tufts, often surrounded by the withered, persistent, more or less curled leaves of the previous year, the culms readily separating, 20-45 cm. high, very slender, erect, spreading or almost drooping at the summit, glabrous, minutely puberulent or rarely pilose; leaf -sheaths usually equaling or exceeding the internodes, sparsely to densely papillose-pilose, the papillae often obscure; blades elongate and erect, usually overtopping the panicles until maturity, 10-35 cm. long (the lower shorter), 2-4 mm. wide, scabrous on both surfaces or often pubescent on the lower, rarely on the upper surface, usually ciliate near the base with long hairs; panicles finally long-exserted, 5-10 cm. long, half to two thirds as wide, rather few-flowered, the scabrous, flexuous branches remote, ascending; spikelets 2.2-2.7 mm. long, 1.3-1.5 mm. wide, oblong-elliptic, obtuse, sparsely pilose with weak, spreading hairs; first glume one fourth to one third the length of the spikelet, obtuse, or pointed by the inrolling of the margins ; second glume and sterile lemma equal and equaling the fruit at maturity ; fruit 2-2.1 mm. long, 1.2 mm. wide, oval, obscurely umbonate at the summit.
Autumnal phase similar, the reduced secondary panicles produced on short basal branches
mostly concealed in the tuft of basal leaves.
Typs locality : Washington, District of Columbia. Distribution: Maine to Minnesota, and south to Georgia and Texas.

Panicum werneri Scribn. ; Nash, in Britt. & Brown,
111. Fl. 3 : 501. 1898.
Panicum delawarense Ashe, Bull. N. Car. Exp. Sta. 175: 116. 1900.
Vernal phase similar to that of P. linearif olium, typical specimens differing as follows:
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culms stiff er; nodes usually sparingly pilose; leaf -sheaths glabrous, often shorter than the
internodes; blades firmer, shorter and wider, 15 cm. long or less, the lower culm-blades 3.5-6
cm. long, 3-6 mm. wide, a few long hairs at the rounded base, scabrous on both surfaces, not
pubescent; spikelets 2.1-2.4 mm. long, 1.2-1.3 mm. wide, nearly or quite glabrous.
Autumnal phase similar to the vernal, remaining simple or late in the season bearing
simple branches from the lower, rarely from the basal, nodes.
Type locality: Ohio.
Distribution: Maine to Minnesota, and south to Ohio and Texas.

Perennials, Terrestrial, not aquatic, Rhizomes present, 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, or 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 lanceolate, Leaf bla des very narrow or filiform, less than 2 mm wide, Leaf blades 2-10 mm wide, Leaf blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Leaf blades more or less hairy, Ligule present, Ligule a fringe of hairs, Inflorescence terminal, Inflorescence an open panicle, openly paniculate, branches spreading, 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, Stamens 6, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis.

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

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

Panicum linearifolium là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Scribn. mô tả khoa học đầu tiên năm 1898.