Panicum hallii Vasey

Panicum filipes Scribn.; A. Heller, Bot. Expl. Texas 13
1895.
Plants palegreen, in small dense tufts, erect or ascending, 30-80 cm. high; culms simple or sparingly branching, stiff, glabrous except the appressed-pubescent nodes; leaf -sheaths shorter than the internodes, glabrous or sparsely appressed-hispid toward the summit; ligule about 1.5 mm. long; blades thin, ascending or laxly spreading, 10-25 cm. long, 3-8 mm. wide, flat,
glaucous and glabrous on the upper surface, glabrous beneath or very sparsely papillosehirsute; panicles exserted, usually equaled or exceeded by the uppermost blades, 7-25 cm. long, about as wide, the distant branches spreading, the branchlets rather more numerous and the spikelets usually longer-pediceled than in P. diffusum; spikelets 2-2.6 mm. long, about 1 mm. wide; first glume about two thirds the length of the spikelet, acuminate, 3-5-nerved, second glume and sterile lemma 5-7-nerved; fruit 1.5-1.7 mm. long, about 0.8 mm. wide, elliptic.
Type locality: Corpus Christi, Texas.
Distribution : Southern Texas.

Panicum hallii Vasey, Bull. Torrey Club 11: 61. 1884
Plants rather glaucous-green, in small tufts, erect, 15-60 cm. high; culms simple or sparingly branching from the lower nodes, glabrous except the appressed-pubescent nodes; leaves commonly more or less crowded toward the base, the blades becoming curled or twisted, the lower sheaths overlapping on the short internodes; leaf -sheaths sparsely papillose-hispid to glabrous; ligule about 1.5 mm. long; blades erect or nearly so, 4-15 cm. long, 2-6 mm. wide, flat, usually sparsely papillose-ciliate toward the base, otherwise glabrous or with a few long, delicate hairs on the upper surface or sparingly papillose-hispid beneath, often with a thin, cartilaginous, white margin, curling, with age, like shavings; panicles usually long-exserted and much exceeding the leaves, 6-20 cm. long, rather narrowly flabellate in outline, the few branches stiffly ascending, bearing short, appressed branchlets with approximate spikelets on short, appressed pedicels; spikelets 3-3.7 mm. long, 1.1-1.5 mm. wide, turgid; first glume half to two thirds the length of the spikelet, acuminate, 3-5-nerved ; second glume and sterile lemma strongly 5-7-nerved; fruit 1.7-2 mm. long, 1-1.3 mm. wide, oval, obtuse, dark olive-brown at maturity.
Type locality: Austin, Texas.
Distribution: Texas to Arizona, and south to central Mexico.

Perennials, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, Stems geniculate, decumbent, or lax, sometimes rooting at nodes, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stems branching above base or distally at nodes, Stem nodes bearded or hairy, 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, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath hairy, hispid or prickly, Leaf sheath hairy at summit, throat, or collar, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, Leaf blades more or less hairy, Leaf blades scabrous, roughened, or wrinkled, Leaf blades glauco us, blue-green, or grey, or with white glands, 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, Spikelet less than 3 mm wide, Spikelets with 1 fertile floret, Spikelets with 2 florets, Spikelet with 1 fertile floret and 1-2 sterile 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 4-7 nerved, Lemma similar in texture to glumes, Lemma 5-7 nerved, Lemma glabrous, Lemma apex ac ute or acuminate, 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, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear.

Panicum hallii, commonly known as Hall's panicgrass, is a perennial bunch grass in the genus Panicum which is native to the south/southwestern regions of the United States, and into southern Mexico.

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

Panicum hallii là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Vasey mô tả khoa học đầu tiên năm 1884.