Oryzopsis asperifolia Michx.

Oryzopsis asperifolia Michx. Fl. Bor. Am. 1:51. 1803
Oryzopsis mutica Link. Enum. 1:4!. 1821. (Type from North America.) Urachne asperifolia Trin. Gram. Unifl. 174. 1824. (Based on Oryzopsis asperifolia Michx.) Urachne leucosperma Link, Hort. Berol. 1: 94. 1827. (Type from Albany, New York.) Urachne mulica Steud. Nom. Bot. ed. 2. 2: 731. 1841. (Based on Oryzopsis miilica Link.) Oryzopsis leucosperma Link; Walp. Ann. 3: 728. 1852. (As synonym of Urachne asperifolia Trin.)
Culms cespitose, glabrous above, faintly scaberulous below, the innovations erect, the fertile culms widely spreading or prostrate, 20-70 cm. long, nearly naked, the two or three sheaths bearing reduced or obsolete blades; sheaths glabrous or faintly scaberulous, those of the culm elongate; ligule a narrow erose ciliolate rim less than 1 mm. long; blades erect, firm, scabrous, flat to somewhat rolled, elongate, 3-8 mm. wide, tapering toward apex, the lower end narrowed to a long involute or folded base, glaucous beneath; panicle narrow, nearly simple, rather few-flowered, 5-8 cm. long, the short branches or pedicels appressed ; pedicels 3-6 mm. long; glumes 6-8 mm. long, somewhat obovate, about 7-nerved, abruptly pointed or apiculate, white-margined above; lemma about as long as the glumes, pale or yellowish at maturity, oblong below, tapering and acute, above sparsely pubescent on the body, densely pubescent at base; awn fle.xuous, angled, scabrous, 5-10 mm. long.
Type locality: Hudson Bay to Quebec.
Distribution: Wooded slopes and dry banks, Newfoundland to British Columbia and Montana, and southward to Connecticut, Indiana, South Dakota (Black Hills), and (in the mountains) New Mexico.

Annuals, Perennials, Terrestrial, not aquatic, 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, Stems branching above base or distally at nodes, 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 sheath ing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Leaf blades scabrous, roughened, or wrinkled, Leaf blades glaucous, blue-green, or grey, or with white glands, 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 dorsally compressed or terete, 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 equal to or longer than adjacent lemma, Glume equal to or longer than spikelet, Glume surface hairy, villous or pilose, Glumes 4-7 nerved, Lemma coriaceous, firmer or thicker in texture than the glumes, Lemma 5-7 nerved, Lemma body or surface hairy, Lemma apex acute or acuminate, Lemma distinctly awned, more than 2-3 mm, Lemma with 1 awn, Lemma awn less than 1 cm long, Lemma awn 1-2 cm long, Lemma awned from tip, Lemma awns straight or curved to base, Lemma margins thin, lying flat, Lemma margins inrolled, tightly covering palea and caryopsis, Lemma straight, Callus or base of lemma evidently hairy, Callus hairs shorter than lemma, Palea present, well developed, 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.

Oryzopsis asperifolia là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Michx. mô tả khoa học đầu tiên năm 1803.