178 A TEXT-BOOK OF GRASSES 



FF. Fruit elliptic; pubescence short or 



none. 



G. Inflorescence of slender racemes, 

 more or less digitately ar- 

 ranged SYNTHERISMA 



(Par. 216). 



GG. Inflorescence a capillary panicle.. LEPTOLOM A. 

 DD. Fruit indurated, rigid (or if thin, not 



hyaline-margined) . 



E. Spikelets (or the primary one of a 



pair) placed with the back of the 



fruit turned away from the rachis, 



usually solitary (not in pairs). 



F. First glume and the rachilla joint 



forming a swollen ring-like callus 



below the spikelet ERIOCHLOA. 



FF. First glume present or wanting but 

 no ring-like callus below the 

 spikelet. 

 G. First glume present; racemes 



racemose along the main axis . . BRACHIARIA. 

 GG. First glume wanting; racemes 



digitate or subdigitate AXONOPUS 



BE. Spikelets placed with the back of the (Par. 215). 

 fruit turned toward the rachis of 

 of the spike-like racemes, or pedicel- 

 late in panicles. 



p. Fruit long-acuminate, scarcely in- 

 durated; both glumes wanting; 

 spikelets sessile, solitary in spike- 

 like racemes, these reflexed or 

 verticillate at maturity. Florida, 



rare REIMAROCHLOA. 



FF. Fruit not long-acuminate, indurated. 



G. First glume typically wanting; 



spikelets plano-convex, subses- 



sile in spike-like racemes PASPALUM 



GG. First glume present; spikelets (Par. 214). 



usually in panicles. 

 H. Glumes and lemmas unawned. 

 I. Second glume inflated-sac- 

 cate, this and the sterile 

 lemma much exceeding the 



stipitate fruit SACCIOLEPIS. 



n. Second glume ' not inflated- 

 saccate. 



j. Culms (in pur species) 

 woody; fruit with a tuft 

 of down at apex. Florida.LASiACis. 



