Muhlenbergia minutissima (Steud.) Swallen

Sporobolus microspermus (Lag.) Hitchc. Jour. Wash. Acad 23:453. 1933.
Milium micros permum Lag. Gen. & Sp. Nov. 2. 1816.
Agrostis minutissima Steud. Syn. Gram. 171. 1854. (Type from New Mexico, Fendler 986.)
Vilfa confusa Fourn. Mex. PI. Gram. 101. 1886. (Type from Mexico; Hall &* Harbour 643 from
the United States also cited by Fournier.) Sporobolus confusus Vasey, Bull. Torrey Club 15: 293. 1888. (Based on Vilfa confusa Fourn.) Sporobolus confusus var. aberrans Jones, Contr. W. Bot. 14: 10. 1912. (Specimens cited from
Bowie, Arizona, and Juarez, Mexico.) Sporobolus minutissimus Hitchc. Proc. Biol. Soc. Wash. 41: 161. 1928. (Based on Agrostis minutissima Steud.)
Annual; culms erect or spreading, branched below, slender, puberulous or scaberulous, 10-30 cm. tall; sheaths striate, scaberulous; ligule thin, pointed, 1-2 mm. long; blades flat, lax, scaberulous, mostly less than 10 cm. long, 1-2 mm. wide; panicles oblong, open, half or two thirds as long as the entire culm, the axis glabrous below, scaberulous above, the branches spreading, scabrous, glabrous in the axils, the pedicels slender, spreading, thickened below the spikelets; spikelets 1-1.8 mm. long; glumes obtuse, about equal, half to three fourths as long as the spikelet or a little more, distinctly or obscurely pilose; lemmas obtuse, pubescent on midnerve and margins.
Type locality: Mexico (grown in Spain from seed sent by Sesse).
Distribution: Sandy or rocky open ground, Montana and eastern Washington to Nebraska, Texas, New Mexico, and southern California; Costa Rica.

Annuals, Terrestrial, not aquatic, Rhizomes present, Rhizome elongate, creeping, stems distant, Stems trailing, spreading or prostrate, Stems nodes swollen or brittle, 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, Ste ms 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, Leaf blades more or less hairy, 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, Spikelet less than 3 mm wide, Spikelets with 1 fertile floret, Spikelets solitary at rachis nodes, Spikelets all alike a nd 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, Glume surface hairy, villous or pilose, Glumes 1 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma similar in texture to glumes, Lemma 3 nerved, Lemma glabrous, Lemma apex truncate, rounded, or obtuse, 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 minutissima is a species of grass known by the common name annual muhly. It is native to North America.

Agrostis minutissima é uma espécie de gramínea do gênero Agrostis, pertencente à família Poaceae.

Muhlenbergia minutissima là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Steud.) Swallen mô tả khoa học đầu tiên năm 1947.