90 SPIKELETS AND [CH. 



Lepturus, Spartina, Gynodon, Gastridium, Lagurus, Poly- 

 pogon, Leersia. 



Spikelbts with one perfect flower and one or more male or 

 rudimentary ones. 



Digraphis. Roleus. 



Anihoxanthum. Arrhenatherum. 



And the rare genera Hierochloe and Panicum. 



Spikelbts with at least two perfect flowers. 



Molinia. Triodia. 



Arwndo. Sesleria. 



A vena. Koeleria. 



Aira (some species). Melica (one species). 



Brorrms. Briza. 



Cynosurus. Poa trimalis. 



Oactylis. Catahrosa. 



Spikelets with at least three perfect flowers and usually more. 



Elymim. Festuca. 



Agropyrum. Poa. 



Brachypodium. Olyceria. 

 Lolium. 



Inflorescence, a spike of single spikelets. 



Agropyrum. Lolium. 



Brachypodium. Nardus. 



And varieties of Festuca Myurus and F. loliacea, &c. 



Inelobescence, a spike of pairs or tufts of three or 

 more spikelets. 



Elymus (pairs). Cynosurus (clusters). 



Hordefwm (threes). 



Intlorescence, a cylindrical closely tufted spike-like panicle. 



PMeum. Psamma. 



Alopeeurus. Anthoscanthum. 



