144 THE TRUE GRASSES. 



<] Styles distinct, lodicules 

 grown together. 



263. Glyceria. 



< <d 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 ; hilurn 

 punctiform. 



X Flowering glumes cartilag- 

 inous at the base, upper 

 half herbaceous. 



255. Sclerochloa. 



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. 

 D Hilum linear. 



265. Festuca. 

 D Hilum punctiform. 

 Spikelets in a simple 

 or branched raceme. 



266. Catapodium. 

 Spikelets in a short- 

 branched panicle. 



267. Scleropoa. 



XX Palea pectinately fringed 

 on the keels. 



271. Brachy podium. 



fifi. Stigmas two, plainly arising below the 

 apex (lateral) on the anterior portion of the 

 ovary ; empty glumes awnless. 



268. Bromus. 



