FESTLCE.E. 443 



a. Panicle spikelike, floral glumes terminating in 9-23 

 plumose awns 97 



a. Panicle lax, floral glumes terminating in 9-11 irregu- 

 lar lobes 98 



a. Panicle racemose, floral glumes terminating in 3-5 

 rigid lobes 103 



a. Panicle subspieate, floral glumes terminating in 5 deli- 

 cate awns 104 



a. Spikelets in threes on a jointed racliis, floral glumes 

 deeply 4-cleft with awns between the lobes. ... 09 



a. Plant dioscious, floral glumes of fertile florets 3-cleft. 100 

 B. Floral glumes entire or 2-toothed to 2-cleft, awnless or 



with 1 awn (b) 



b. Tall reedlike grasses (e) 



c. Floral glumes clothed with long hairs 105 



0. Eachilla (alone) clothed with long hairs. . . ,106 



b. Xot reedlike, floral glumes naked or containing hairs 

 shorter than the glumes (d) 



d. Stigmas with short hairs on all sides (e) 



e. S^iikelets dia^cious, solitar}^ terminal, enclosed 



by terminal bracts 101 



e. Spikelets in twos and threes, terminating in 

 leafy branches 102 



e. Spikelets in an ovoid or cylindrical panicle, low- 

 est s])ikelets with bracts at the base 104 



d. Stigmas plumose (f) 



f. Spikelets of two forms, the fertile 1-3-flowered; 



the sterile with awned glumes (g) 



g. Fertile spikelets 1-flowered 125 



g. Fertile spikelets 2-3-flowered 124 



f. Spikelets all alike (h) 



h. Floral glumes 2-3-toothed, lateral nerves 



and callus usually hairy (i) 



i. Spikelets 3- to many-flowered. . . . 107 



i. Spikelets 3-5-flowered 108 



h. Floral glumes of some other structure, . . (j) 



