18 
(¢) Spikes 2 to 5, rarely more, not digitate, 
* Spikelets 1 line long or less. 
12. P. ceespitosum, Fliigge. (Vasey in Bull. Torr. Club, x111. 164.) Culms cespitose. 
1 to 14 feet high, slender; leaves flat, the lower ones 3 to 6 inches long, three-fourths 
line wide, smooth, sparsely ciliate at the base, upper sheaths very long; spikes 3 to 
4,1 to 2 inches long, at intervals of about 1 inch; rachis very narrow; spikelets very 
small (one¢alf to three-fourths line), elliptical, smooth, puberulent, or glandular, 
irregularly in 3 rows, in pairs, one pedicelled ; empty glumes 3- to 5-nerved —Florida 
(A. HT. Curtiss). 
14. P. Drummondii. (Dimorphostachys Drummondii Fourn.; P.lentiginosum Presl.? 
Vasey in Bull. Torr. Club, xt. 164.) Culms 2 to 4 feet high, branching below, 
smooth; leaves 6 to 10 inches long, 3 to 5 lines wide; panicle terminal, sometimes 
with lateral branches; spikes 3 to 4, arcuate, 3 to 4 inches long, rather slender; 
spikelet in 2 or 3 rows, rather lax, 1 line long, oval, pubescent and granular spotted, 
generally with a small lower glume, as in Panicum. Intermediate between P. seta- 
cecum and P, lave.—Florida (J. H. Simpson) and Texas (G. C. Nealley, No. 350 
Drummond), 
* * Spikelets from 1 to 14 lines long. 
15. P. elatum Richard. (Vasey in Bull. Torr. Club, xu. 167.) Culm erect, sub- 
compressed, striate, glabrous; sheaths and leaves glabrous, the leaves linear, elon- 
gated, narrowly acuminate, scabrous at least above; ligule membranaceous, short ; 
axis of panicle, scabrous; spikes 5 to 7, subfasciculate, sessile, approximate, erect or 
subfalcate, elongated ; spikelets in twos, short-pediceled, narrowly obovate, twice as 
wide as the axis; glumes obovate, 5-nerved, smooth; valves longitudinally punctu- 
late, striate. 
Thisdescription is from Doell’s Graminese Brasiliensis. A specimen with this name 
from Florida is in Gray Herb. 
16. P. lividum Trin. (Vasey, Bull. Torr. Club, x11. 164.) Culms 2 to 24 feet high, 
smooth, simple; leaves long and narrow, smooth, sheaths compressed; spikes 4 to 5, 
+ inch to 1 inch distant, 1 to 1d inches long, erect; spikelets compressed oval or ovate, 
acutish, smooth, in 3 or 4 rows, imbricated, sometimes pale, sometimes purplish.— 
Texas (Nealley 807, E. Halls.) 
17. P. Buckleyanum Vasey. Bull. Torr. Club, xu. 167. Culms 3 feet high, firm 
(not robust), smooth, pale green; leaves elongated, complanate, narrow (2 lines), 
smooth ; spikes 3 to 6, 1 to 14 inches distant, 1 to 14 inches long; rachis straight, 
narrow; spikelets in pairs, in three or four rows, imbricated, about 14 lines long, lance- 
ovate, acute, sparsely pubescent, slightly longer than the obtuse flower.—Texas 
(Buckley). 
18. P. leave Michx. (Gray’s Manual, 6th ed., p. 628.) Culms erect, sometimes de- 
cumbent at base, rather slender, 2 to4 feet, high; leaves variable in width and length, 
smooth, or the sheaths sometimes pubescent; spikes 2 to 6, usually 3 or 4, about 1ineh 
apart, spreading, somewhat hairy in the axil, 2 to 5 inches long; rachis narrow and 
flexuous; spikelets in 2 rows, about 1} to 1} lines long, smooth, roundish; empty 
glumes 5-nerved,—Massachusetts to Texas, 
Var. BREVIFOLIUM, leaves 4 to 6 inches long, 4 to 6 lines wide. (P. undulosum Le 
Conte.) 
Var. ANGUSTIFOLIUM, tall; lower leaves a foot or more long and narrow spikes 4 to6 
inches long. (P. angustifolium Le Conte. ) 
19. P. preecox Walt. (Chapm., Fl. 8. States, p. 571.) (P. lentiferum Lam. ?) 
Culms erect, 2 to 4 feet high, simple; leaves long and narrow, 8 to 12 inches long, 2 
to 4 lines wide, smooth or pubescent; spikes 3 to 6, 1 to 14 inches apart, erect, 14 to 
3 inches long; rachis straight and flat; spikelets in pairs, mostly in three rows, or- 
bicular compressed, about 14 lines long; empty glumes smooth, 3-nerved.—North 
Carolina to Texas, 
