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.. Leptoloma. 

 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). 

 p. First glume and the rachilla joint 

 forming a swollen ring-hke callus 



below the spikelet Eriochloa. 



FP. First glume present or wanting but 

 no ring-like caUus below the 

 spikelet. 

 G. First glume present; racemes 



racemose along the main axis. .Brachiaria. 

 GG. First glume wanting; racemes 



digitate or subdigitate Axonopus 



EE. 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- 

 hke racemes, these reflexed or 

 verticillate at maturity. Florida, 



rare Reimarochloa. 



pp. 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 our species) 

 woody; fruit with a tuft 

 of down at apex. Florida. Lasiacis. 



