84 PANICACE.E. 



e. Spikes more than one to the culm (f) 



f. Spikes 1-2 cm. long 11 



f. Spikes 3-4 cm. long, var. of P. inops. . . 11 



f. Spikes longer (g) 



g. Spikelets 1.7 mm. long, spikes 4-15 cm. 



long 12 



g. Spikelets longer (h) 



h. Rachis more or less pubescent. ... 13 



h. Perhaps some plants of number. . . 17 



h. Rachis glabrous (i) 



i. Spikes 3-5, spikelets about 2 mm. 



long 14 



i. Spikes 5-8, spikelets 2-2.3 mm. 



long 15 



i. Spikes 3-7, spikelets 3 mm. long. . 16 

 i. Spikes mostly single, spikelets 2.2 



mm. long 17 



a. Eachis not enclosing the spikelets, usually 1 mm. or 



more wide (j) 



j. Spikelets more or less hairy or puberulent (k) 



k. Spikelets narrowly elliptical, acute, ciliate on the 



margins, 3.3 mm. long 18 



k. Spikelets oval, acute, 3-4 mm. long 19 



k. Spikelets oval, obtuse; spikes 3-6 20 



J. Spikelets glabrous (m) 



m. Spikes 2 (sometimes 1),8-16 cm. long ; spikelets 



oval, 2.5-3 mm. long 21 



m. Spikes more than 2 to the ciilm (n) 



n. Rachis 2 or nearly 2 mm. wide ; spikelets 



2-2.3 mm. long 22 



n. Rachis rarely 2 mm. wide in some plants of 



number 23 



n. Rachis 2 mm. wide; spikeleis 2.5 mm. long. . 24 



n. Rachis 2 mm. wide; spikelets 3 mm. long. . 25 



n. Rachis narrower (p) 



p. Spikelets subacute, 2.5-3 mm. long; rachis 



