Sporobolus junceus (P. Beauv.) Kunth

Sporobolus poiretii (R. & S.) Hitchc. Bartonia 14: 32. 1932
Agrostis compressa Pair, in Lam. Encyc. Suppl. 1: 258 (no. 78). 1810. Not .1. compressa Willd
1790, nor Poir. op. cit. 1: 259. 1810. Axonopus Poiretii R. 8c S. Syst. Veg. 2: 318. 1817. (Based on Agrostis compressa Poir. "n. 78.,"
and the basis of Sporobolus Poiretii.) Agrostis tenuissima Spreng. Svst. 1: 258. 1825. (Described from Wist Indies and Smith America ; Vilfa exilis Trin. Mem. Acad. St.-Petersb. VI. 6 2 : 89. 1840. (Type from Jalapa, Merit Vilfa Berleroana Trin. Mem. Acad. St.-Petersb. VI. 6 2 : 100. 1840. (Type from Santo Domingo.) Sporobolus angustus Buckl. Proc. Acad. Phila. 1862: 88. 1863. (Type from Tea Vilfa tenacissima var. exilis Fourn. Mex. PI. Cram. 99. 1886. (Based on Vilfa exilis Trin.) Vilfa tenacissima var. intermedia Fourn. Mex. PI. Gram. 99. 1886. (Type from Mexic Vilfa tenacissima var. robusta Fourn. Mex. PI. Gram. 100. 1886. (Tvpe from Mexi< Sporobolus Berteroanus Hitchc. & Chase, Contr. U. S. Nat. Herb. 18: 370. 1917. I Based on Vilfa
Berleroana Trin.)
Perennial; culms erect, solitary or in small tufts, glabrous, 30-100 cm. tall; sheaths glabrous, more or less pubescent on the margin and around the throat, somewhat keeled; ligule firm, less than 0.5 mm. long, ciliolate; blades flat at base, usually more or less involute above, tapering to a long fine point, glabrous or nearly so except the scabrous point; elongate, 2-5 mm. wide at base; panicle usually spikelike, but more or less interrupted, 10-40 cm. long, the branches appressed or ascending, closely flowered, the middle ones mostly less than 1 cm. long; spikelets about 2 mm. long; glumes obtuse, somewhat unequal, about half as long as the spikelet or less; lemma acutish.
Type locality: Carolina (Bosc).
Distribution: Open ground and waste places, Virginia to Tennessee and Arkansas; on ballast in Oregon and New Jersey; also tropical Asia; apparently introduced in America.

Sporobolus junceus Kunth, Rev. Gram. 1: 68. 1829
.4 grostis juncea Michx. Fl. Bor. Am. 1: 52. 1803. (Type from Carolina.) Not A.juncea Lam. 1783.
Heleochloa juncea Beauv. Agrost. 24, 147. 1812. (Based on A grostis juncea Michx.)
Colpodium junceum Trin. in Spreng. Neu. Entd. 2: 37. 1821. (Based on Agrostis juncea Michx.)
Crypsis juncea Steud. Nom. Bot. 1: 242. 1821. (Based on Agrostis juncea Michx.)
Vilfa juncea Trin. Gram. Unifl. 157. 1824. (Based on Agrostis juncea Michx.)
Vilfa Schiedeana Trin. Mem. Acad. St.-Petersb. VI. 6 2 : 73. 1840. (Type from Arkansas.)
Vilfa gracilis Trin. Mem. Acad. St.-Petersb. VI. 6 2 : 74. 1840. (Basis of Sporobolus gracilis.)
Vifa fulvescens Trin. Mem. Acad. St.-Petersb. VI. 6 2 : 76. 1840. (Type from North America.)
Vilfa subsetacea Trin. Mem. Acad. St.-Petersb. VI. 6-: 133 (in note). 1840. (Based on V. gracilis
Trin. [op. cit. page 74, not op. cit. page 104].) Vilfa Vinzenti Steud. Syn. Gram. 155. 1854. (Type from Rusk County, Texas.) Aira triglumis Steud. Syn. Gram. 223. 1854. (Type from Rusk County, Texas.) Sporobolus ejuncidus Nash, in Britton, Man. 106. 1901. (Based on Sporobolus junceus Kunth.) Sporobolus gracilis (Trin.) Merrill, Rhodora 4: 48. 1902.
Perennial; culms densely cespitose, erect, slender, glabrous, about 3-noded, 30-60 cm. tall; sheaths glabrous; ligule very short; blades closely folded or involute, glabrous beneath, puberulent on the upper surface near the base, scabrous-pubescent above the base, less than 1 mm. thick as folded; panicles mostly bronze-brown, oblong or narrowly pyramidal, open, 7-15 cm. long, the axis glabrous, the branches in verticils 1-2 cm. (rarely more) apart, flexuous, ascending or usually widely spreading, 2-3 cm. long, naked at base, the short-pediceled spikelets appressed, not overlapping or only slightly so; spikelets about 3 mm. long, glabrous; first glume about half as long as the spikelet, the second as long as the acute lemma or a little longer.
Type locality': Carolina.
Distribution: Pine barrens of the Coastal Plain, southeastern Virginia to Florida and Texas.

Perennials, Terrestrial, not aquatic, 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 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 very narrow or filiform, less than 2 mm wide, Leaf blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Leaf blades more or less hairy, Ligule present, Ligule a fringe of hairs, 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 branch es 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 persistent, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 2 clearly present, Glumes distinctly unequal, Glumes shorter 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 junceus is a species of grass known by the common name pineywoods dropseed. It is native to the southern United States.

This perennial bunchgrass has stems up to a meter tall. The leaves are up to 30 centimeters long and are flat or rolled. They are blue-green in color. The panicle is pyramidal in shape with spreading branches. They are lined with purplish or reddish spikelets.

This grass species is sometimes grazed by livestock, but it is not one of the more palatable grasses. It increases in abundance as the better grasses are consumed, and it indicates a pasture that is declining in quality.

Sporobolus junceus là một loài thực vật có hoa trong họ Hòa thảo. Loài này được (P.Beauv.) Kunth miêu tả khoa học đầu tiên năm 1829.