Muhlenbergia wrightii Vasey ex J. M. Coult.

Muhlenbergia wrightii Vasey, in Coult. Man. 409. 1885
Muhlenbergia coloradensis Mez, Repert. Sp. Nov, 17: 213. 1921. (Type from "Chiann [Cheyenne] Canyon," Colorado, Jones SOO.)
Perennial; culms densely cespitose, erect, slender, puberulent, scabrous below the panicle, about 3-noded, 30-60 cm. tall; sheaths glabrous; ligule truncate, about 1 mm. long; blades flat or usually folded or involute, erect, mostly 5-10 cm. long, scabrous, long-attenuate; panicle spikelike, erect, more or less interrupted below, 5-15 cm. long, the branches densely flowered, appressed, the lower 5-20 mm. long; glumes lanceolate, acuminate or awn-tipped, about 2 ram. long; lemma acuminate or mucronate, minutely pubescent on the lower half, about 3 mm. long.
Type locality: El Paso, Texas (Wright 1986).
Distribution: Plains, rocks, and canyons, Colorado, Utah, New Mexico, Arizona, and northern Mexico.

Perennials, Terrestrial, not aquatic, Stems trailing, spreading or prostrate, 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, Stem internodes hollow, Stems with inflorescence less than 1 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 smooth, glabrous, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades very narrow or filiform, less than 2 mm wide, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal , Inflorescence a contracted panicle, narrowly paniculate, branches appressed or ascending, Inflorescence a dense slender spike-like panicle or raceme, branches contracted, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence spike linear or cylindric, several times longer than wide, 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, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating above the glumes, glumes persistent, Spikelets disarticulating beneath or between the florets, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes shorter than adjacent lemma, Glumes awned, awn 1-5 mm or longer, Glumes 1 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma similar in texture to glumes, Lemma 3 nerved, Lemma glabrous, Lemma apex acute or acuminate, Lemma mucronate, very shortly beaked or awned, less than 1-2 mm, Lemma distinctly awned, more than 2-3 mm, Lemma with 1 awn, Lemma awn less than 1 cm long, Lemma awn from sinus of bifid apex, Lemma awns straight or curved to base, Lemma margins thin, lying flat, Lemma straight, Callus or base of lemma evidently hairy, Callus hairs shorter than lemma, Palea present, well developed, Palea membranous, hyaline, Palea about equal to lemma, Palea 2 nerved or 2 keeled, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear.

Muhlenbergia wrightii là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Vasey ex J.M.Coult. mô tả khoa học đầu tiên năm 1885.