Andropogon angustatus (J. Presl) Steud.

Diectomis laxa Nees, Agrost. Bras. 340. 1829
Diectomis angustaia J. Presl, in Presl, Rel. Haenk. 1 : 333. 1830. Andropogon apricus Trin. M€m. Acad. St. Petersb. VI. 42 : 83. 1836. Andropogon angustatus Steiid. Syn. Gram. 370. 1854. Andropogon Lindenii Steud. Syn. Gram. 389. 1854. Sorgum laxum Kuntze, Rev. Gen. 790. 1891.
Stems erect, up to 1 m. tall, slender, branching above; leaf-sheaths glabrous; ligules 1-2.5 mm. long; blades 1-3 dm. long, 1-2 mm. broad; racemes in 2's-4's, 1.5-2.5 cm. long, the common pedimcle usually included in the spathe, the rachis-internodes and pedicels broadly cuneate, ciliate; sessile spikelet 5 mm. long, oblong, the first scale linear, truncate, the margins broadly infolded, the narrow intercarinal space glabrous, 2-4-nerved, the silky-barbed callus 1 mm. long, the second scale keeled, compressed, obovate-oblong, with a straight awn 2-3 times its length arising from the entire apex, the fourth scale gibbous on the back, 3-nerved, ciliate, bearing below the minutely 2-toothed apex an awn 3-4 cm. long, the hispidulous column geniculate above the middle and shorter than the subula; pedicellate spikelet with the first scale oblong, long-ciliate on the keel, 7-nerved, bearing an awn twice as long as itself, the second scale 3-nerved, shortly awned or awnless.
Type locality : In sunny mountainous places, Serra dos dois Irmaos, Piauhy, Brazil. Distribution : Mexico to Costa Rica; also in Colombia, Venezuela, and Brazil.

Andropogon angustatus là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (J.Presl) Steud. mô tả khoa học đầu tiên năm 1854.