Muhlenbergia jonesii (Vasey) Hitchc.

Muhlenbergia jonesii fVasey) Hitchc. in Jepson, Fl. Calif. 1 : 111. 1912.
Sporobolus Jonesii Vasey, Bot. Gaz. 6: 297. 1881.
Perennial, closely tufted; culms erect, slender, glabrous, scabrous below the panicle, 20-40 cm. tall, the nodes at the base; sheaths glabrous; ligule 2-4 mm. long; blades subfiliform, involute, scabrous, in a basal cluster 51 5 cm. long, the single culm blade 3-5 cm. long ; panicles narrow, 5-8 cm. long, the axis scabrous, the branches appressed or ascending, rather loosely flowered, 1-2 cm. long; glumes broad, scabrous-pubcrulent, obtuse, often erose, about one third as long as the lemma; lemma obscurely pubescent below, tapering to an acuminate or awntipped point, 2.5-3 mm. long.
TvPB locality: S<xla Springs, California (Jones .103 in 1881). Distribution: Open ground, northeastern California.

Perennials, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, Stems caespi tose, 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 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 blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Leaf blades scabrous, roughened, or wrinkled, Ligule present, Ligule an unfringed eciliate 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 laterally compressed, Spike let 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, Glume surface hairy, villous or pilose, Glumes 1 nerved, Glumes 3 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma similar in texture to glumes, Lemma 3 nerved, Lemma body or surface hairy, Lemma apex acute or acuminate, Lemma awnless, Lemma mucronate, very shortly beaked or awned, less than 1-2 mm, Lemma margins thin, lying flat, Lemma straight, 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, Caryo psis ellipsoid, longitudinally grooved, hilum long-linear.

Muhlenbergia jonesii là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Vasey) Hitchc. mô tả khoa học đầu tiên năm 1912.