KEY. 215 



pedicel, awned. Stigmas pencil-form, purple. Spikes filiform, 

 in a crowded, naked raceme. Gymnopogon. 



Gr. III. 19. 



W. y. 54. 



597. Glumes laterally compressed, keeled, coriaceous, 

 pointed. Styles long, exserted, commonly united below, 

 lihacliis of each spike triangular, sometimes continued into 

 a bract-like appendage. The 1-sided spikes racemed, some- 

 times only 4, or 2. (578) Spartina. 



Gr. III. 16. 



W. V. 60. 



Glumes orbicular, or ovate-orbicular, not keeled. 

 Rhachis of each spike flattened, or filiform, bearing the 

 plano-convex spikelets in 2 or 4 rows. Spikes racemed, or 

 rarely, toward the summit of the naked peduncle, in pairs, 

 and therefore looking sometimes like digitate. 



(573) Paspalum. 



598. (568.) Only one, or none of the 3 or 4 pales awned. 



599 

 Two of the four pales awned — that is, the two out- 

 er, one at the base, the other near the apex, both emarginate 

 and hairy. Glumes 2, the upper one nearly double the 

 length of the lower. Stamens and styles 2, much exserted. 

 Panicle spiked, apparently a cylindric spike. 



Anthoxauthum odoratum, L. 

 Gr. VIT. 54. 

 W. 11. 23. 



599. Spikelets all perfect, arranged in pairs or threes, or 

 scattered 600 



Spikelets, 2 or three at each joint — only one of them, 

 the sessile, perfect 602 



600. One of the 3 pales awned. Spikelets in pairs upon 

 each joint of the slender rhachis — one of them sessile, the 

 other stalked. Spikes crowded in a panicle and clothed with 

 long silky hairs, especially in a tuft around each spikelet. 



Erianthus. 

 Gr. VIII. 63. 

 W. V. 67. 

 Flowers not awned 601 



