Agrostis howellii Scribn. ex Vasey

Agrostis howellii Seribn. Contr. U. S. Nat. Herb. 3: 76. 1892
Perennial; culms ascending from a geniculate base, glabrous, 3or 4-noded, leafy, 40-60 cm. tall; sheaths glabrous or minutely roughened; ligule 3-4 mm. long; blades flat, lax, scabrous, as much as 30 cm. long, 3-5 mm. wide; panicle loose and open, 10-30 cm. long, the branches flexuous, scabrous, verticillate, those of the second and third order few-flowered toward the ends; glumes somewhat unequal, acuminate, rather narrow and firm, somewhat scabrous on the keel, about 3.5 mm. long; lemma acute, 4-toothed, 2.5 mm. long, awned from near the base, the awn bent, exserted about 6 mm.; palea wanting.
Type locality: Hood River, Oregon {Howell 198). Distribution: Multnomah and Hood River counties, Oregon.

Perennials, Terrestrial, not aquatic, 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, 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 2-10 mm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, 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, Lower panicle branches whorled, Flowers bisexual, Spikelets pedicellate, Spikelets laterally compressed, Inflorescence or spikelets partially hidden in leaf sheaths, subtended by spatheole, 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 distinctly unequal, Glumes equal to or longer than adjacent lemma, Glume equal to or longer than spikelet, Glumes 1 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma 5-7 nerved, Lemma glabrous, Lemma apex dentate, 3-5 fid, Lemma distinctly awned, more than 2-3 mm, Lemma with 1 awn, Lemma awn less than 1 cm long, Lemma awn subapical or dorsal, Lemma awn once geniculate, bent once, Lemma margins thin, lying flat, Lemma straight, Callus or base of lemma evidently hairy, Callus hairs shorter than lemma, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear.

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

Agrostis howellii là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Scribn. ex Vasey mô tả khoa học đầu tiên năm 1892.