Muhlenbergia utilis (Torr.) Hitchc.

Muhlenbergia utilis (Torr.) Hitchc. Jour. Wash. Acad Sci. 23:453. 1933.
Vilfa utilis Torr. Pacif. R. R. Rep. 5': 365. 1858.
Viifa saca'.illa Fourn. Mex. PI. Gram. 101. 1886. (Type from Mexico.)
Sporoholus utilis Scribn. Bull. U. S. Dep. Agr. Agrost. 17: 171. 1899. (Based on Vilfa ulilis Torr.)
Perennial, with slender creeping rhizomes; culms glabrous, slender, branching, lax, widely spreading or prostrate, 20-40 cm. long; sheaths mostly shorter than the internodes, glabrous, the acuminate prophyllum often protruding from the throat; ligule 0.5 mm. long or less; blades numerous, mostly involute, glabrous beneath, scabrous-puberulent on the upper surface, scabrous on the margins, spreading and usually somewhat recurved, usually 1-2 cm. long, sometimes 3-4 mm. long, 1 mm. wide when flat; panicles narrow, interrupted, 1-4 cm. long, the branches short, appressed, the axis and very short pedicels nearly glabrous; glumes subequal, broad, obtuse or acutish, a little less than half as long as the spikelet; lemma terete, lanceolate, acute or acuminate, slightly apiculate, about 2 mm. long ; palea about as broad and as long as the lemma. Similar to M. repens but usually more delicate with finer leaves and with smaller spikelets.
Type uocAunv: Between Tejon Pass and Lost Hills. California (Blake).
Distributio.v: Wet places, marshy soil, and along ditches and streams, Texas, Arizona, southern California, Nevada, and Mexico.
Iuuistration: Bull. U. S. Dep. Agr. Agrost. 17:/. 467.

Perennials, Terrestrial, not aquatic, Rhizomes present, Rhizome elongate, creeping, stems distant, 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 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 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 ped icel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes shorter than adjacent lemma, 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 awnless, 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 utilis is a species of grass known by the common name aparejograss.

Muhlenbergia utilis là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Torr.) Hitchc. mô tả khoa học đầu tiên năm 1933.