120 NORTH AMERICAN FLORA ([VorumE 17 
25. Andropogon Bourgaei Hack. Flora 68: 134. 1885. 
Andropogon glaucescens Fourn. Mex. Pl. Gram. 60, in part. 1881. 
Sorgum Bourgaei Kuntze, Rev. Gen, 791. 1891. 
Stems 1 m. tall or more, sparingly branched above, the branches usually in pairs; leaf- 
sheaths glabrous; blades 4-6 mm. wide, linear, acute, rough, especially on the margins, glabrous 
or somewhat hairy, those on the innovations up to 3 dm. long, those on the stem up to 2 dm.; 
spathes 5-6 cm. long, glabrous; racemes 4—6 cm. long, in pairs or in 3’s on a peduncle which is 
barbed at the apex, exserted from the spathe, nodding, the internodes of the rachis slender, 
equaling the sessile spikelets; sessile spikelet 4-5 mm. long, the first scale acute, nerveless 
except for the hispidulous keels, the intercarinal space somewhat depressed and glabrous, 
the callus barbed with hairs more than one half as long as the scale, the fourth scale lanceolate, 
l-nerved, entire, awnless; pedicellate spikelet usually staminate, rarely empty or reduced toa 
single scale, 5-5.5 mm. long, lanceolate, the first scale 5-nerved, the second 3-nerved. 
TYPE LOCALITY: Orizaba, Vera Cruz. 
DISTRIBUTION: Vera Cruz. 
26. Andropogon provincialis Lam. Encyc. 1: 376. 1783. 
Andropogon Gerardi Vitm. Summa Pl. 6:16. 1792. 
Andropogon furcatus Muhl.; Willd. Sp. Pl. 4: 919. 1806. 
Andropogon ternarius Bertol. Mem. Accad. Bologna 2: 600. 1850. Not 4. fernarius Michx. 
1803. 
Andropogon provincialis furcatus Hack. in DC. Monog. Phan. 6: 442. 1889. 
Andropogon provincialis Lindheimeri Hack. in DC. Monog. Phan. 6: 443. 1889. 
Andropogon provincialis pycnanthus Hack. in DC. Monog. Phan. 6: 443. 1889. 
Sorgum provinciale Kuntze, Rev. Gen. 792. 1891. 
Stems 1-2 m. tall; leaf-sheaths glabrous or hirsute; blades 6 dm. long or less, up to 12 mm. 
wide, smooth or rough, glabrous or hirsute; racemes in 2’s—6’s, 5-10 cm. long, stout, long- 
exserted, the hairs of the internodes and pedicels grayish, 1-2 mm. long; sessile spikelet 7-10 
mr. long, more or less hispidulous, the awn 7-15 mm. long, perfect, geniculate; pedicellate 
spikelet as large as or a little smaller than the sessile, staminate, awnless. 
TYPE LOCALITY: Provence, France. 
DISTRIBUTION: Maine to Saskatchewan, and south to Florida, Texas, and northern and cen- 
tral Mexico; also in France. 
ILLUSTRATIONS : Vasey, Agr. Grasses U.S. p1.27; ed. 2. pl. 29; Bull. U. S. Dep. Agr. Agrost. 
7: f.14; 20: f. 73; Bull. Tenn. Exp. Sta.5: f.5;7: pl. 2,f.7; Britt. & Brown, Ill. Fl. f 219; 
Schreb. Beschr, Gris. p/. 48; Bull. U. S. Dep. Agr. Bot. 1: pl. 3; 6: pl. 8; Cire. U. S. Dep. 
Agr. Agrost.4: fi 3. 
27. Andropogon chrysocomus Nash, in Britton, Man. 70. 1901. 
A tall usually stout perennial with extravaginal innovations. Stems 7-15 dm. tall, the 
branches in 1’s—3’s; leaf-sheaths smooth and glabrous; blades up to 3 dm. long, 7 mm. wide 
or less, smooth beneath, a little roughened above; racemes in 2’s—4’s, 5~9 cm. long, stout, long- 
exserted, the hairs of the internodes and pedicels 3-4 mm. long, usually yellow; sessile spikelet 
8-10 mm. long, lanceolate, barbed at the base with hairs about 1 mm. long, the first scale 
hispid on the keels, the margins broadly infolded, the intercarinal space canaliculate-de- 
pressed and hispidulous toward the apex, the second scale hispid on the keel toward the apex; 
the fourth scale 2-toothed at the apex, bearing a perfect geniculate awn 10-12 mm. long; 
pedicellate spikelet equaling the sessile one, awnless. 
TYPE LOCALITY: [Stevens County,] Kansas. 
DISTRIBUTION : Nebraska and Wyoming to Texas. 
28. Andropogon tennesseensis Scribn. Circ. U. S. Dep. Agr. 
Agrost. 16:1. 1899. 
Andropogon provincialis tennesseensis Scribn. Bull. Tenn. Exp. Sta. 7:23, 1894. 
Stems 1-1.5 m. tall, stout, the branches in 1’s or 2’s; leaf-sheaths, at least the lower ones, 
hirsute toward the summit; blades 6 dm. long or less, 6-12 mm. wide, rough, the lower surface 
‘sometimes hirsute, and also the upper surface near the base; racemes in 2’s-4’s, 5-8 cm. long; 
‘sessile spikelet about 8.5 mm. long, broadly lanceolate, twice as long as the hispidulous inter- 
‘nodes, strongly hispidulous, the awn of the fourth scale geniculate, about 1.5 cm. long, the 
