Parr 2, 1912] POACEAE 119 
the fourth scale muticous, or with an awn equaling or shorter than itself; pedicellate spikelet 
wanting, or up to 1.5 mm. long, empty, or rarely as large as the sessile spikelet and staminate. 
TYPE LOCALITY: Banks of rivulets in the valley of Caripa, Cumana, Venezuela. 
DISTRIBUTION : Throughout tropical America. 
22. Andropogon ternarius Michx. Fl. Bor. Am. 1: 57. 1803. 
Andropogon argenteus Ell. Bot. S. C. & Ga. 1: 148, 1816. Not A. argenteus DC. 1813. 
Andropogon argyraeus Schultes, in R. & S. Syst. Veg. Mant. 2: 450. 1824. 
Andropogon Muhlenbergianus Schultes, in R. & S. Syst. Veg. Mant. 2: 455. 1824. 
Andropogon Belvisii Desv. Opusce. 67. 1831. 
Sorgum argenteum Kuntze, Rev. Gen. 790. 1891. 
Andropogon argyracus tenuis Vasey, Contr. U. S. Nat. Herb. 3:12. 1892. 
Andropogon argyraeus macrus Hack.; Scribn. & Ball, Bull. U. S. Dep. Agr. Agrost. 24: 39. 1901. 
Andropogon mississippiensis Scribn. & Ball, Bull. U. S. Dep. Agr. Agrost. 24: 40. 1901. 
Stems tufted, 8-12 dm. tall, about twice as long as the basal leaves, the branches in 1’s-3’s; 
leaf-sheaths smooth or rough, glabrous or hirsute; blades 3 dm. long or less, up to 3 mm. wide, 
rough; racemes in pairs, rather stout, silvery-gray, 3-5 cm. long, long-exserted; sessile spike- 
let 5-6 mm. long, about twice as long as the internodes, the first scale appressed-pubescent 
on the nerveless intercarinal space which is usually deeply canaliculate-depressed, acuminate 
from about the lower third, the margins narrowly infolded, the keels densely hispid, the fourth 
scale with the awn 1.5—-2.5 cm. long; pedicellate spikelet of a single scale, 1-3 mm. long, the 
pedicel usually a little shorter than the sessile spikelet. 
TYPE LOCALITY: In mountains, Carolina. ‘ 
DISTRIBUTION: Delaware to Missouri and Oklahoma, and south to Florida and Texas. 
ILLUSTRATIONS: Bull. U. S. Dep. Agr. Agrost.7: f. 17; 24: f 15; Bull. Tenn. Exp. Sta. 7: 
pl.2,f.8, Britt. & Brown, Ill. Fl. f. 217; Beauv. Agrost. pl. 23, f. 4. 
23. Andropogon Cabanisii Hack. Flora 68: 133. 1885. 
Sorgum Cabanisii Kuntze, Rev. Gen. 791. 1891. 
Stems 6-10 dm. tall, the branches in 1’s or 2’s; leaf-sheaths smooth or a little roughened; 
blades 2.5 dm. long or less, 2-4 mm. broad, smooth beneath, rough above; spathes 6-8 cm. 
long; racemes in pairs, on a peduncle which is densely barbed at the apex, 4~7 cm. long, grayish, 
the internodes of the rachis shorter than the sessile spikelets, the hairs at the apex of the inter- 
nodes aboiit equaling them, rather scant; sessile spikelet 5-7 mm. long, broadly lanceolate, 
tapering from the middle, the first scale strongly hispidulous and 2- or 3-nerved between the keels, 
the nerves running the entire length of the scale, the intercarinal space a little depressed, the 
callus barbed with short hairs, the fourth scale bearing a very slender awn 1.5-2 cm. long, 
slightly spiral at the base; pedicellate spikelet of a single hispidulous scale 3—3.5 mm. long, 
the pedicel about two thirds as long as the sessile spikelet. © 
TYPE LOCALITY : Florida. : 
DISTRIBUTION : Pennsylvania (according to Hackel),and Florida. 
24, Andropogon Scribnerianus Nash, Bull. N. Y. Bot, 
Gard. 1: 432. 1900. 
Andropogon Elliottit glaucescens Scribn. Bull. Torrey Club 23: 145. 1896. Not A. glaucescens 
H.B.K. 1816. 
Glaucous. Stems tufted, 3-10 dm. tall, twice as long as the basal leaves, rather sparsely 
branched above; leaf-sheaths shorter than the internodes, smooth and glabrous; blades 1 dm. 
long or less, up to 2.5 mm. wide, the upper surface minutely pubescent and also often hirsute 
near the base; racemes in pairs, stout, long-exserted, 4-7 cm. long, bright and silvery-white, 
the hairs on the internodes copious, those at the summit about twice the length of the internode; 
sessile spikelet 5-6 mm. long, about twice as long as the internodes, the first scale narrowed 
from about the middle, the intercarinal space flat or nearly so, usually 1-3-nerved, glabrous 
and shining, or sometimes hispidulous at the apex, the awn of the fourth scale more or less 
‘contorted and bent, somewhat twisted below, 1-1.5 cm. long; pedicellate spikelet wanting, 
or present as a small scale 1.5 mm. long or less, the pedicel equaling or a little shorter than the 
sessile spikelet. 
TYPE LOCALITY: Eustis, Lake County, Florida. 
DISTRIBUTION : Georgia and Florida. 
