Panicum havardii Vasey

Panicum havardii Vasey, Bull. Torrey Club 14: 95. 1887
Panicum virgatum macranthum Vasey, Bull. Torrey Club 13: 26. 1886. Not P. macranthum Trin. 1826.
Plants 1 meter tall or more, pale-green, glaucous, glabrous throughout; culms robust,
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solitary, erect from creeping rootstocks, simple; leaf-sheaths longer than the internodes; ligule dense, about 3 mm. long; blades erect or ascending, 25-40 cm. long, 5-10 mm. wide, broadest at the base, tapering into long, involute-setaceous tips, sometimes pilose on the upper surface at the base; panicles short-exserted, as much as 40 cm. long, half to three fourths as wide, loosely flowered, the mostly verticillate branches ascending or finally spreading; spikelets 6-8 mm. long, about 2 mm. wide, ovate, acuminate, strongly nerved; first glume clasping, half to two thirds the length of the spikelet, acuminate; second glume slightly shorter than the sterile lemma, both exceeding the fruit, 7-9-nerved; fruit 4.5-5 mm. long, about 1.8 mm. wide, narrowly ovate, the margin of the lemma inrolled only at base.
Type locality: Guadalupe Mountains, Texas.
Distribution: Western Texas, southern New Mexico, and adjacent Mexico.

Perennials, Terrestrial, not aquatic, Rhizomes present, Rhizome elongate, creeping, stems distant, Stems nodes swollen or brittle, Stems geniculate, decumbent, or lax, sometimes rooting at nodes, Stems solitary, 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 with inflorescence 1-2 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath s mooth, glabrous, Leaf sheath or blade keeled, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, Leaf blades glaucous, blue-green, or grey, or with white glands, Ligule present, Ligule a fringed, ciliate, or lobed membrane, 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 pre sent, 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 acute 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 havardii is a species of grass known by the common name Havard's panicgrass. It is native to North America, where it occurs in northern Mexico and Texas and New Mexico in the United States.

This species is a rhizomatous perennial grass with stems up to 63 inches long with an open panicle up to 15 inches long and wide. It grows on sand dunes and in arroyos, where it helps to stabilize areas of open sand. It helps prevent erosion. It provides a forage for cattle when it is young but it is otherwise unpalatable for animals.

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

Panicum havardii là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Vasey mô tả khoa học đầu tiên năm 1887.