104 NORTH AMERICAN FLORA [VoLuME 17 
7. Schizachyrium Salzmanni (Trin.) Nash. 
Rotiboellia Salemanni Trin.; Steud. Syn. Gram. 361. 1854. 
? Apogonia glabrata Fourn. Mex. Pl. Gram. 63, 1881, 
Andropogon imberbis muticus Hack. in DC. Monog. Phan. 6: 380. 1889. 
Sorgum Salzmanni Kuntze, Rev. Gen. 790, 1891. 
A smooth and glabrous tufted perennial, with numerous leaves crowded at the base, the 
sheaths equitant. Stems 4-6 dm. tall, somewhat compressed, branching above, the branches 
single or in pairs; leaf-sheaths compressed, keeled; blades up to 2 dm. long, 2-3 mm. wide, 
usually complanate, the midnerve very prominent beneath; spike-like racemes 3-7 cm. long, 
about 2 mm. in diameter, the rachis straight, the internodes stout, glabrous, with an oblique 
crenulate margin at the apex, about two thirds as long as the sessile spikelets, the pedicels 
usually a little longer than the internodes, glabrous, or rarely with a few long hairs at the 
deeply 2-toothed apex; sessile spikelet 6-7 mm. long, lanceolate, the first scale coriaceous at 
the yellowish base, the acute green apex often curved to one side, 7-9-nerved, the second scale 
acute, considerably shorter than the first, the fourth scale entire at the apex, awnless; ped- 
icellate spikelet green, of 3 or 4 scales, awnless, sometimes with a staminate flower. 
TYPE LOCALITY: Bahia, Brazil. 
DISTRIBUTION : Guadeloupe ; Martinique ; Mexico to Paraguay. 
8. Schizachyrium tenerum Nees, Agrost. Bras. 336. 1829. 
Andropogon gracilis J, Presi, in Pres], Rel. Haenk. 1: 336. 1830. Not A. gracilis Spreng. 1825. 
Andropogon tener Kunth, Rév. Gram. 565. 1832. 
Andropogon leptophyllus Trin. Mém. Acad. St. Petersb. VI. 2: 264. 1832. 
Andropogon Presiit Kunth, Enum. 1: 489. 1833. 
Andropogon tener scabriglumis Hack. in DC. Monog. Phan. 6: 379. 1889. 
Sorgum tenerum Kuntze, Rev. Gen. 792. 1891. 
A smooth and glabrous tufted perennial, with intravaginal innovations. Stems often 
weak and decumbent, 4-10 dm. long, the branches in 1’s or 2’s; leaf-blades 2 dm. long or less, 
0.5—2 mm. wide, the lower ones often sparingly hirsute above near the base; spike-like racemes 
3-6 cm. long, the rachis straight, the internodes stout, channeled on the inner surface, about 
two thirds as long as the sessile spikelets, glabrous, the pedicels linear, not stout, pilose on the 
outer margin near the summit, usually equaling or a little exceeding the internodes; sessile 
spikelet about 4 mm. long, the first scale somewhat rounded.on the back, smooth or rough, 
acute, the fourth scale deeply 2-cleft at the apex for less than one half its length, the awn of the 
fourth scale 7-10 mm. long, the column tightly spiral, exserted, about equaling the subula; 
pedicellate spikelet consisting of a single scale, 4-5 mm. long, awnless or awn-pointed. 
TYPE LOCALITY: Montevideo, Uruguay. : 
DISTRIBUTION : Georgiaand Florida to Louisiana ; Illinois ; Cuba ; continental tropical America. 
ILLUSTRATIONS: Kunth, Rév. Gram. f/. 197; Bull. U. S. Dep. Agr. Agrost. 17: f. 709. 
9. Schizachyrium semiberbe Nees, Agrost. Bras. 336. 1829. 
Andropogon vaginatus J. Presl, in Presl, Rel. Haenk. 1: 336. 1830. Not 4. vaginalus Ell. 1816° 
Andropogon velaius Kunth, Enum. 1: 488, 1833. 
Andropogon semiberbis Kunth, Enum, 1: 489. 1833. 
Andropogon semiberbts genuinus pruinatus Hack. in DC. Monog. Phan. 6: 370. 1889. 
Andropogon semiberbis incertus Hack. in DC. Monog. Phan. 6: 370. 1889. 
Sorgum semiberbe Kuntze, Rev. Gen. 792. 1891. 
A smooth and glabrous tufted perennial, with intravaginal innovations. Stems 6-12 
dm. tall, the branches in 1’s or 2’s; leaf-sheaths compressed, keeled; blades 3 dm. long or 
less, 2-5 mm. wide; spike-like racemes 5-8 cm. long, partially included at the base, the inter- 
nodes equaling or shorter than the sessile spikelets, glabrous, or rarely with a few short hairs, 
the pedicels stout, oblong-elliptic, shorter than the internodes, ciliate only on the outer margin; 
sessile spikelet 5-7 mm. long, the first scale rounded on the back, glabrous, or rarely with a few 
short hairs, roughened, acuminate, the edges of the infolded margins touching each other, the 
third and fourth scales ciliate, the latter deeply 2-cleft nearly to the base, the awn 12-15 mm. 
long, the brown column tightly spiral, exserted, about equaling the subula; pedicellate spike- 
let consisting of a single hispidulous scale about 3 mm. long, with an awn about as long. 
TYPE LOCALITY: Southern Brazil. . 
DISTRIBUTION: Florida to Cuba and Porto Rico, and from Mexico to Ecuador and Brazil. 
ILLUSTRATIONS: Bull. U. S. Dep. Agr. Agrost. 17: f. 710; Field Columb. Mus. Publ. Bot. 3: 
20, f- 
