108 NORTH AMERICAN FLORA [Volume 17 
the internodes, ciliate on the margins with long hairs; sessile spikelet 8-9 mm. long, about 
twice as long as the internodes, the first scale glabrous, the fourth scale deeply 2-cleft at the 
apex for less than one half its length, the awn 1-1.5 cm. long, the brown column tightly spiral, 
a little shorter than the subula; pedicellate spikelet 5-7 mm. long, awnless, consisting of 4 
scales, the outer 2 acuminate and usually awn-pointed, the fourth scale enclosing a staminate 
flower. 
TYPE LOCALITY :” Sandy coast, western Florida. 
DISTRIBUTION : Along the seacoast, western Florida to Mississippi. 
ILLUSTRATION: Bull. U. S. Dep. Agr. Agrost. 17: f. 318. 
e 
19, Schizachyrium stoloniferum Nash, in Small, Fl. SE. 
U.S. 59. 1903. 
A tall perennial, with long creeping rootstocks and long extravaginal innovations. Stems 
6-10 dm. tall, branched; leaf-sheaths keeled, more or less hirsute on the margins near the 
summit; blades 2 dm. long or less, 2-5 mm. wide, smooth beneath, rough above and hirsute 
near the base; spike-like racemes 3-4 cm. long, the rachis straight or somewhat flexuous, 
the internodes one half to two thirds as long as the sessile spikelets, ciliate on the margins 
above with long grayish hairs, the pedicels usually longer than the internodes, ciliate on the 
margins above with long grayish hairs; sessile spikelet 6-7 mm. long, acuminate, the first 
scale usually very rough on the back, the fourth scale entire at the apex, the awn 8-10 mm. 
long, the column spiral, shorter than the subula, not exserted; pedicellate spikelet of a single 
scale about 3 mm. long, hispidulous, bearing an awn shorter than itself. 
TYPE LOCALITY : Western Florida. 
DISTRIBUTION : Florida. 
20. Schizachyrium triaristatum Nash, in Small, Fl. SE. 
U.S. 60. 1903. 
A perennial with creeping rootstocks and long extravaginal innovations. Stems 6-8 
dm. tall, branching; leaf-sheaths keeled, more or less hirsute on the margins near the summit; 
blades 1.5 dm. long or less, 3-5 mm. wide, hirsute above near the base; spike-like racemes 3-5 
em. long, the rachis usually straight, or sometimes flexuous, the internodes about one half as 
long as the sessile spikelets, ciliate with long grayish ascending hairs, the pedicels usually 
longer than the internodes and shorter than the sessile spikelets, long-ciliate with grayish 
ascending hairs, commonly recurved; sessile spikelet 9-10 mm. long, acuminate, the first 
scale smooth or nearly so, the keels sometimes extending into short awns, the fourth scale 
shortly 2-toothed at the apex, the awn 12-15 mm. long, the column tightly spiral, little 
if at all exserted; pedicellate spikelet of 2 scales, 6-8 mm. long, the first scale hispidulous, 
3-awned. 
TYPE LOCALITY: Florida. 
DISTRIBUTION : Known only from the type locality. 
21. Schizachyrium gracile (Spreng.) Nash, in Small, Fl. SE. 
U.S. 60. 1903. 
Andropogon gracilis Spreng. Syst. 1: 284. 1825. 
? Andropogon juncifolius Desv.; Hamilt. Prodr.9. 1825. 
Sorgum gracile Kuntze, Rev. Gen, 791. 1891. 
A tufted perennial, with extravaginal innovations, smooth and glabrous with the excep- 
tions mentioned below. Stems slender, rigid, 2-6 dm. tall, branched, the branches single or in 
pairs; leaf-sheaths glabrous, shorter than the internodes, strongly striate; blades 2 dm. long 
or less, very slender, terete, 0.8 mm. in diameter or less, strongly striate; spike-like racemes 
long-exserted, 3-5 cm. long, silvery-white, the rachis somewhat flexuous, the internodes a 
little shorter than the sessile spikelets, slender, the back and margins clothed with long hairs, 
those at the summit more than twice as long as the internodes, the pedicels as long as or a 
little shorter than the sessile spikelets; sessile spikelet 5-6 mm. long, the first scale char- 
taceous, faintly 2-nerved in addition to the keels, entire, smooth on the back, the keels his- 
