165 
alternate, slightly spreading, 1 to 134 inches long; rhachis nar- 
row, straight; spikelets in four rows, a little more than 1 line 
long, oval, acutish, smooth, pale green; sterile glumes three- 
nerved, a little longer than the flowering ones. (867 E. Hall, 
Texas. ) oe 
15. P. precox, Walt. (P. lentiferum, Lam. ?.)—Culms 2 to 3 
feet high, simple, smooth; leaves long and narrow, smooth. or 
hairy below; panicle long exerted, 4 to 5 inches long; spikes 3 
to 6, 1%4 to 2 inches long; rhachis straight and flat; spikelets in 
three or four rows, nearly orbicular, obtuse, I to 1% lines long; 
sterile glumes smooth, three-nerved. 
Var. CURTISIANUM (P. Curtisianum, Steudel.), larger and 
stouter, spikes 6.to 8, spikelets large, leaves and sheaths hairy. 
16. LP. leve, Michx.—Culms 2 to 4 feet high, simple; pan- 
icle 3 to6 inches long; spikes 3 to 5, rather slender, 2 to 4 
inches long; rhachis narrow and flexuous; spikelets single in two 
rows, about 1% lines long, oval or nearly orbicular, smooth ; 
sterile glumes smooth, five-nerved, (two very near the margin.) 
Var. UNDULOSUM (P. undulosum, Le Conte), leaves flat, 4 to 6 
inches long, 4 to.5 lines wide, the margins undulate. 
Var. ANGUSTIFOLIUM, (P. angustifolium, Le Conte), leaves 
6 to 10 inches long, narrow, spikes usually longer. 
17. P. plicatulum, Michx.—Culms 2 to 3 feet high, rather 
slender, smooth, simple ; panicle 3 to 5 inches long; spikes 114 to 
3 inches long, rather slender; rhachis narrow, flexudus ; spike- 
lets in pairs, rather lax,:forming 2 or 3 series, smooth, oval or 
obovate-elliptical, obtuse; sterile glumes about five-nerved, the 
second or flat one when’ mature with 2 to 3 transvetse plications 
on each side neat the margin; flowering glume brownish purple. 
18. P. remotum, Remy. (?) (P. Halli, V. & S.)—Culms 2 to 
3 feet high, rooting at the lower joints and branching below, 
the nodes pubescent; panicle 3 to 4 inches long; spikes 3 to 6, 
approximate, rather thick, 11% to 2% inches long; rhachis wide, 
nearly straight; spikelets mostly in four rows, I to 1% lines long, 
ovate or oval, obtuse; sterile spikelets about five-nerved, pubes- 
cent, or nearly smooth. (804 E. Hall, Texas.) . 
Var. glaucum, Scribner.—Culms erect and more rigid, spikes. 
5 to 7, spikelets more elliptical. : 
