Sporobolus purpurascens (Sw.) Ham.

Sporobolus purpurascens (Sw.) Hamilt. Prodr. 5. 1825
Agrostis purpurascens Sw. Prodr. 25. 1788.
Vilfa purpurascens Beauv. Agrost. 16, 182. 1812. (Based on Agrostis purpurascens Sw.)
Vilfa pilifera var. latifolia Rupr. Bull. Acad. Brux. 9: 228. 1842. Name only, for Galeotti 5706.
Vilfa Grisebachiana Fourn. Mex. PI. Gram. 98. 1886. (Type from Cuba.)
Vilfa densiflora Fourn. Mex. PI. Gram. 98. 1886. (Type from Orizaba, Botteri 139)
Vilfa Liebmanni Fourn. Mex. PI. Gram. 100. 1886. (Type from Mexico.)
Perennial; culms erect, glabrous, mostly 2-3-noded, 30-60 cm. tall; sheaths glabrous; ligule erose, scarcely 0.5 mm. long; blades flat or loosely involute, glabrous, remotely ciliate with long hairs from papillae or papillose only, 5-15 cm. long, the uppermost shorter, 1-4 mm. wide; panicles contracted, sometimes almost spikelike, dark-brown or purple, more or less interrupted, 7-15 cm. long, the axis glabrous, the branches in verticils, appressed or somewhat ascending, floriferous nearly to base, 1-2 cm. long or the upper shorter; spikelets 3-4 mm. long, glabrous, first glume acuminate, about half as long as the spikelet; second glume, lemma, and palea about the same length.
Type locality: Jamaica.
Distribution: Sandy prairies, southern Texas, eastern Mexico, Revillagigedo Islands (.Socorro,

Perennials, Terrestrial, not aquatic, Rhizomes present, Stems nodes swollen or brittle, Stems erect or ascending, 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 basal, below midd le of stem, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath hairy, hispid or prickly, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, Leaf blades more or less hairy, Ligule present, Ligule a fringe of hairs, Inflorescence terminal, Inflorescence simple spikes, 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, Lower panicle branches whorled, 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 and fertille, Spikelets bisexual, Spikelets disarticulating above the glumes, glumes persis tent, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes distinctly unequal, Glumes equal to or longer than adjacent lemma, Glumes 1 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma similar in texture to glumes, Lemma 1 nerved, Lemma glabrous, Lemma apex acute or acuminate, Lemma awnless, Lemma straight, 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.

Sporobolus purpurascens là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (Sw.) Ham. miêu tả khoa học đầu tiên năm 1825.