DESCRIPTIONS OF TRIBES AND GENERA. 139 



O O Branches of the panicle again 

 with branchlets, these be- 

 coming shorter above. 



< Spikelets loosely 2-4- 

 flowered, conical; rachilla 

 articulated. 222. Molinia. 



< < Spikelets densely many- 

 flowered ; rachilla usually 

 continuous: if articulated, 

 the spikelet not conical. 



223. Eragrostis. 



ft Primary panicle-branches dis- 

 tichous, usually branched again 

 at the base. 



O Empty glumes much longer 

 than the flowering glumes. 



221. Dissanthelium. 

 O O Empty glumes not at all or 

 only a little longer than the 

 flowering glumes. 



< Panicle spike-like or very 

 much contracted, usually 

 dense. 



X Second empty glume 

 much broader and 

 somewhat longer than 

 the flowering glumes. 

 D Flowering glumes 

 broadly obtuse, 

 awnless. 



225. Eatonia. 

 D D Flowering glumes 

 awned. 



226. Avellinia. 



XX Second empty glumes 



not broader nor longer 



than the flowering 



glumes. 227. Kceleria. 



<J < Panicle diffuse, with long 



slender branches. 



