338 POACE.E. 



c, Sjjikelets 2 mm. long, panicle purplish, open, 10- 



12 cm. long 9 



c. Spikelets 3-4 mm. long; panicle lanceolate, 15 cm. 



long 10 



c. Spikelets 4-6 mm. long, glumes acuminate, pani- 

 cle open, purplish 11 



c. Spikelets 4.5 mm. long, panicle spikelike, 6-8 cm. 



long 12 



c. Sjiikelets 4-5 mm. long, acute, panicle spikelike, 



5-7 cm. long 13 



c. Spikelets 5 mm. long, panicle open, silvery green, 



6-12 cm. long 14 



c. Spikelets 5-6 mm. long, panicle thin, 8-12 cm. long. 15 

 c. Spikelets 5-6 mm. long, panicle rather loose, 12- 



25 cm. long 16 



c. Spikelets 5-7 mm. long, jianicle rather dense, 8-15 



cm. long 17 



c. Spikelets 6-7 mm. long, acuminate, panicle dense, 



6-10 mm. long 18,19 



c. Spikelets 2.3-4 mm. long (d) 



d. Unawned 20 



d. Awn starting at the apex of the notch of its 

 glume, panicle open, wliitish green, 10-15 cm. 



long. . 21 



d. Awn starting below the notch of its glume. . (e) 

 e. Panicle rather dense, purple, spikelets 4 mm. 



long 22 



e. Panicle interrupted, 12-15 cm. long, spike- 

 lets 4 mm. long 23 



e. Panicle open, 10-20 cm. long, spikelets gap- 

 ing, 2.5-3.5 mm. long, awn very slender, 



straight 24 



e. Panicle lanceolate, 15 cm. long, spikelets 2- 



3 mm. long 10 



e. Panicle loose, 4-20 cm. long, spikelets 4 mm. 

 long 25 



