PART 2, 1912] POACEAE 117 
stem 13-17 cm. long, sparingly hirsute, those on the innovations densely hirsute with ascending 
hairs, the terminal one very narrow and tightly embracing the stem, the upper sheaths on some 
of the stems much enlarged and producing in their axils smaller spathes with concealed racemes; 
blades erect, 2 dm. long or less, 2-3 mm. broad, smooth beneath, hirsute above near the base; 
racemes in 2’s~4’s, flexuous, 5-10 cm. long; sessile spikelet 5 mm. long, usually much exceeded 
by the internodes, the terminal hairs of which are 8-10 mm. long, the awn more or less contorted, 
1.5-2 cm. long, barely if at all twisted at the base; pedicellate spikelet wanting, or present as 
a minute rudimentary scale, the pedicel much exceeding the sessile spikelet. 
TYPE LOCALITY: Eustis, Lake County, Florida. 
DISTRIBUTION : Florida and Mississippi. 
16. Andropogon Elliottii Chapm. Fl. S. U.S. 581. 1860. 
Andropogon clandestinus Hale; Vasey, Grasses U.S.19. 1883. Not A. clandestinus Nees, 1854. 
Andropogon Elliottti gracilior ‘Hack. in DC. Monog. Phan. 6: 415. 1889. 
Sorgum Eiliottii Kuntze, Rev. Gen. 791. 1891. 
? Andropogon gyrans Ashe, Jour. Elisha Mitchell Soc. 15: 113. 1898. 
Andropogon gracilior Nash, in Small, Fl. SE. U.S. 63. 1903. 
Stems tufted, 5-8 dm. tall, 2-3 times as long as the basal leaves, the nodes at the base of 
the inflated sheaths densely barbed; leaf-sheaths shorter than the internodes, the lower ones and 
those of the innovations often appressed-hirsute, those of the inflorescence much enlarged and 
densely crowded at the summit and also sometimes at the nodes below, 5-11 cm. long, 2-6 mm. 
wide; blades 2 dm. long or less, 2-5 mm. wide, usually smooth beneath, rough above and 
hirsute near the base; racemes in pairs, very rarely in 3’s, 2-4 em. long, one peduncle at each 
node exserted from the spathe, the remainder with the racemes concealed; sessile spikelet 
3.5-5 mm. long, narrowly linear-lanceolate, equaling or somewhat exceeding the internodes, 
the. first scale very acute, the keels hispidulous, the fourth scale 2-cleft for about one quarter 
of its length, awned from between the teeth, the awn geniculate, 1.5-2.5 cm. long, usually 
spiral at the base, the column exserted, much shorter than the subula; pedicellate spikelet a 
rudimentary scale, the pedicel usually much longer than the sessile spikelet. 
TYPE LOCALITY: Wet or dry pine barrens, Florida. 
DISTRIBUTION : Southern New Jersey to Florida, Missouri, and Texas. 
ILLUSTRATIONS: Bull. U. S. Dep. Agr. Agrost. 7: jf. 2; Bull. Tenn. Exp. Sta. 7: p1.3, f.9;5 
Britt. & Brown, Ill. Fl. f. 222. 
17. Andropogon brachystachyus Chapm. Fl. S. U.S. 
ed. 2. 668. 1883. 
Sorgum brachystachyum Kuntze, Rev. Gen. 791. 1891. 
Stems tufted, 6-15 dm. tall; the branches in 1’s—3’s and usually pilose just below the 
nodes; leaf-sheaths smooth and glabrous; blades erect, 3 dm. long or less, 3-4 mm. wide, smooth 
beneath, on the upper surface rough and hirsute near the base; spathes narrow, 3—-3.5 cm. long, 
glabrous, brown; racemes in pairs, shortly exserted, or partly included at the base, 1-2 cm. 
long, the very slender rachis somewhat flexuous, the internodes about one half as long as 
the sessile spikelets, filiform; sessile spikelet linear-lanceolate, 3-4.5 mm. long, the first scale 
pubescent between the keels, canaliculate-depressed upon the back, the callus barbed with 
hairs a little shorter than the scale, the fourth scale very shortly 2-toothed, with an awn 6-9 
mm. long; pedicellate spikelet consisting of a single scale, the pedicel shorter than the sessile 
spikelet. 
TYPE LOCALITY: Eastern Florida. 
DISTRIBUTION : Florida. 
ILLUSTRATION: Bull. U.S. Dep. Agr. Agrost. 17: f. 316. 
18. Andropogon arctatus Chapm. Bot. Gaz. 3: 20. 1878. 
Andropogon tetrastachyus distachyus Chapm. Fl. 8. U. S. 581. 1860. Not A. distachyos L. 1753. 
Sorgum arctatum Kuntze, Rev. Gen. 791. 1891. ; 
Stems 1-1.5 m. tall, branched toward the summit, the branches in 1’s-3’s; leaf-sheaths, 
at least the lower ones, more or less densely appressed-hirsute at the summit; blades erect, 
3 dm. long or less, up to 5 mm. wide, the upper surface rough, the lower usually densely ap- 
