130 NORTH AMERICAN FLORA (VoLumE 17 
5. Sorghastrum incompletum (J. Presi) Nash. 
Andropogon incompletus J. Presl, in Pres], Rel. Haenk. 1: 342. 1830. 
Andropogon Galeoitit Fourn. Mex. Pl. Gram. 56. 1881. 
Stems 8-12 dm. tall, slender; leaf-sheaths glabrous; blades 1-3 dm. long, 3-7 mm. wide, 
usually flat, rough; panicle 1-3 dm. long, usually narrow and dense, rarely diffuse and broad; 
spikelets 4 mm. long, hirsute, the perfect awn 2-3 cm. long, the column several times longer 
than the spikelet and geniculate. — 
TYPE LOCALITY: Mexico. 
DISTRIBUTION: Mexico to Costa Rica. 
6. Sorghastrum Elliottii (C. Mohr) Nash. 
Andropogon nuians Ell. Bot. S. C. & Ga. 1: 144. 1816. Not A. nutans. 1753. 
Sorgum nutans Chapm. Fl. S. U. S. 583. 1860. Not S. nutans A. Gray, 1848. 
Sorgum nutans Linnaeanum Hack. in Mart. Fl. Bras. 23: 276. 1883. 
Andropogon nutans Linnaeanus Hack. in DC. Monog. Phan. 6: 531. 1889. 
Chrysopogon Elliottit ©. Mohr, Bull. Torrey Club 24: 21. 1897. 
Chrysopogon nutans Linnaeanus C. Mohr, Bull. Torrey Club 24: 21. 1897. 
Andropogon Linnaeanus Scribn. & Kearney; Scribn. & Ball, Bull. U.S. Dep. Agr. Agrost. 24: 40. 
1901. 
Sorghasirum Linnaeanum Nash, in Small, Fl. SE. U. S. 66. 1903. 
Stems 1-1.5 m. tall; leaf-sheaths smooth and glabrous; blades 4 dm. long or less, up to 
1 cm. wide, very rough; panicle 1.5-3 dm. long, the apex usually nodding, its branches erect 
or nearly so, at least the lower ones much exceeding the internodes of the axis, 6-8 cm. long, 
the ultimate divisions straight; spikelets 5.5-7.5 mm. long, lanceolate, deep chestnut-brown 
at maturity, hirsute, the awn 2.5-3.5 em. long, the column geniculate, several times longer 
than the spikelet. 
TYPE LocaiTy : South Carolina. : . 
DISTRIBUTION: Virginia and Tennesse¢ to Florida and Mexico. 
ILLUSTRATION: Bull, Tenn. Exp. Sta. 7: Al. 4, f. 2. 
7. Sorghastrum secundum (Ell.) Nash, in Small, Fl. SE. 
U.S. 67. 1903. 
Andropogon secundus Ell. Bot. S. C. & Ga. 1: 580. 1821. 
Sorgum secundum Chapm. Fl. S. U. S. 583. 1860. 
Chrysopogon secundus Benth.; Vasey, Grasses U.S. 20. 1883. 
Andropogon unilateralis Hack. in DC. Monog. Phan. 6: 533, 1889. 
Stems 8-14 dm. tall; leaf-sheaths smooth and glabrous; blades 6 dm. long or less, up to 
7 mm. wide, smooth beneath, rough above, often involute; panicle 2-4 dm. long, 1-sided, 
its branches erect or nearly so, rarely exceeding 4 cm. in length, usually shorter than the 
internodes of the axis, the ultimate divisions or peduncles strongly recurved or coiled below 
the spikelets; spikelets 6-8 mm. long, lanceolate, golden-brown at maturity, hirsute, the awn 
of the fourth scale 2.5—3 cm. long, the geniculate column several times longer than the spikelet. 
TYPE LOCALITY: High ridges between the Flint and Chattahoochee rivers, Georgia. 
DisTRIBUTION : South Carolina to Florida. 
ILLUSTRATION: Bull. U. S. Dep. Agr. Agrost. 7: fi 16. 
26. HOLCUS L. Sp. Pl. 1047. 1753. 
Sorgum Adans. Fam. Pl. 2: 38. 1763. 
Blumenbachia Koeler, Descr. Gram. 28. 1802. 
Tall grasses, with broad flat leaf-blades, and large terminal usually decompound, rarely 
compound, panicles, the short racemes, of 1-few internodes, terminating the primary or 
secondary branches. Racemes with the rachis readily or tardily disarticulating, the internodes 
and pedicels linear, filiform, flat or convex on the back, not sulcate, ciliate on the margins, the 
internodes when disarticulated without appendages at the apex. Spikelets dorsally compressed 
in pairs, one sessile, the other pedicellate. Sessile spikelet perfect, the first scale coriaceous, 
its margin narrowly infolded above, involute below, finally shining, convex on the back; second 
scale of similar texture; third scale hyaline; fourth scale oblong or linear, 2-toothed at the 
apex, the perfect awn arising from between the teeth, rarely entire and mucronate or muticous. 
