Agrostis perennans (Walter) Tuck.

Agrostis perennans (Walt.) Tuckerm. Am. Jour. Sci. 45 : 44
1843.
Cornucopiae perennans Walt. Fl. Carol. 74. 1788.
Agrostis Cornucopiae Smith; J. Nichols ["S. Urban"], Gentleman's Mag. 59: 873. 1789. (Based on
Cornucopiae perennans Walt.) Agrostis elegans Salisb. Prodr. Stirp. 25. 1796. (Based on Cornucopiae perennans Walt.) Agrostis anomala Willd. Sp. PI. 1: 370. 1797. (Based on Cornucopiae perennans Walt.) Alopecurus carolinianus Spreng. Nachtr. Bot. Gart. Halle 10. 1801. (Type from Kentucky.)
Not A. carolinianus Walt. 1788. Trichodium decumbens Michx. Fl. Bor. Am. 1 : 42. 1803. (Type from Virginia to Florida, Michaux.) Trichodiurn perennans Ell. Bot. S. C. & Ga. 1: 99. 1816. (Based on Cornucopiae perennans Walt.) Trichodium Muhlenbergianum Schultes; in R. & S. Syst. Veg. Mant. 2: 159. 1824. (Based on
Muhlenberg's Trichodium no. 4, from Pennsylvania [Muhl. Descr. Gram. 62. 1817].) Agrostis Michauxii Trin. Gram. Unifl. 206. 1824. (Based on Trichodium decumbens Michx.)
Not A. Michauxii Zucc. 1809. Agrostis noveboracensis Spreng. Syst. 1: 260. 1825. (Type from New York, Torrey.) Agrostis decumbens Link, Hort. Berol. 1: 80. 1827. (Based on Trichodium decumbens Michx.)
Not A. decumbens Host, 1809. Trichodium noveboracense Schultes, in R. & S. Syst. Veg. Mant. 3: Addit. 555. 1827. (Based on
Agrostis noveboracensis Spreng.) Trichodium scabrum [Muhl. misapplied by] Darl. Fl. Cestr. 1 : 54. 1837. (Type from Pennsylvania.) Agrostis Schweinitzii Trin. Mem. Acad. St.-Petersb. VI. 6 2 : 311. 1841. (Type from Pennsylvania,
Schweinitz.) «.
Agrostis oreophila Trin. Mem. Acad. St.-Petersb. VI. 6 2 : 323. 1841. (Type from Bethlehem,
Pennsylvania.) Agrostis Schiedeana Trin. Mem. Acad. St.-Petersb. VI. 6 2 : 327. 1841. (Type from Mexico.) Agrostis novae-angliae Tuckerm. Mag. Hort. Hovey 9: 143. 1843. (Type from White Mountains,
New Hampshire.) Agrostis campyla Tuckerm. Am. Jour. Sci. II. 6: 231. 1848. (Type from New England.) A groslis scabra var. perennans Wood, Class-Book ed. 1861. 774. 1861. (Presumably based on A .
perennans Tuckerm.) Agrostis chinanlla Fourn. Mex. PI. Gram. 96. 1886. (Type from Chinantla, Mexico.) Agrostis perennans var. aestivalis Vasey, Contr. U. S. Nat. Herb. 3: 76. 1892. (Type from Athens,
Illinois; the slender lax form.) Agrostis intermedia Scribn. Bull. Torrey Club 20: 476. 1893. (Type from Pine Mountain, Harlan
County, Tennessee. Kearney 39.) Not A. intermedia Balb. 1801. Agrostis pseudoinlermedia Harwell, Ann. Rep. Comm. Parks & Boul. Detroit 11: 46. 1900. B I ed
on .4. intermedia Scribn.) Agrostis Scribneriana Nash, in Small, Fl. SK. l T . S. 126. 1903. (Based on .1. intermedia Scribn.) Agrostis perennans var. humilis Farwell, Papers Mich. Acad. 1 : 87. 1921 i Detroit,
Michigan. Farwell 567 2 §.)
Perennial; culms erect or decumbent at base, varying from weak and lax to relativelj stoul and tall, glabrous, 30-100 cm. tall; sheaths glabrous or slightly rough; ligule 2-5 mm. long; blades flat, lax to stiffly upright, scabrous, 10-20 cm. long, 1-6 mm. wide, those of the culm several; panicle pale-green or tawny, oblong, open, 10-20 or even 30 cm. long, the branches ascending, scabrous, capillary, naked on the lower half, verticillate, the branchlets appressed or divaricately spreading; glumes acute or acuminate, scabrous on the keel, 2-3 mm. long; lemma awnless, rarely awned, 1.5-2 mm. long; palea minute or wanting.
Type locality: South Carolina.
Distribution: Open ground, old fields and open woods, in rather dry soil from sea level to the tops of mountains, Quebec to Minnesota, and southward to Florida and Guatemala.

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, Leaf blades scabrous, roughened, or wrinkled, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal, Inflorescence an open panicle, openly paniculate, branches spreading, Inflorescence a contracted panicle, narrowly paniculate, branches appressed or ascending, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence lax, widely spreading, branches drooping, pendulous, Inflorescence branches more than 10 to numerous, Lower panicle branches whorled, Flowers bisexual, 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 b etween the florets, Entire inflorescence falling intact, as a tumbleweed, 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 truncate, rounded, or obtuse, Lemma awnless, Lemma margins thin, lying flat, Lemma straight, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear.

Agrostis perennans, the upland bentgrass, upland bent, or autumn bent, is a species of flowering plant in the grass family, Poaceae.

Agrostis altissima var. laxa é uma espécie de gramínea do gênero Agrostis, pertencente à família Poaceae.

Agrostis perennans là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Walter) Tuck. mô tả khoa học đầu tiên năm 1843.