144 THE TRUE GRASSES. 



<\ Styles distinct, lodicules 

 grown together. 



263. G-lyceria. 

 < < Styles none, lodicules dis- 

 tinct. . . . 264. Atropis. 

 ft Lateral nerves of the flowering 

 glumes arched, converging above 

 toward the mid- vein. 

 O Rachilla with a fringe of stiff 

 hairs. . . 262. Graphephorum. 

 O O Rachilla naked, downy, or with 

 flexuose (or webby) hairs. 

 <] Flowering glumes strongly 

 keeled on the back ; hilum 

 punctiform. 



X Flowering glumes cartilag- 

 inous at the base, upper 

 half herbaceous. 



255. Selerochloa. 

 XX Flowering glumes mem- 

 branaceous or herbaceous 

 at the base. . . 258. Poa. 

 <\ <\ Flowering glumes rounded on 

 the back, at least below. 

 X Palea rough or minutely 

 fringed upon the keels. 



□ Hilum linear. 



265. Festuca. 



□ Hilum punctiform. 



§ Spikelets in a simple 

 or branched raceme. 

 266. Catapodium. 

 §§ Spikelets in a short- 

 branched panicle. 



267. Scleropoa. 

 XX Palea pectmately fringed 

 on the keels. 



271. Br achy podium. 

 /?/?. Stigmas two, plainly arising below the 

 apex (lateral) on the anterior portion of the 

 ovary ; empty glumes awnless. 



268. Bromus. 



