Graminaceae 19 



S. Spikelets 2 or more flowered. Flowering glumes 

 I or 3-nerved, all alike. 



Spikelets arranged in a spike-like panicle. Flowering 

 glumes scarious. Koeleria. 



Spikelets conical, terete, in a slender panicle. 

 Flowering glumes cartilaginous. Molinia. 



Spikelets in effuse panicle, branches whorled. Flower- 

 ing glumes coriaceous. Catabrosa. 



e. Spikelets 2 or more flowered. Flowering glumes 

 3-5 -nerved, upper empty, convolute. Melica. 



f. Spikelets 3-many-flowered. Flowering glumes 

 5 or more nerved. 



Spikelets few-flowered, clustered in secund panicles. 



Dactylis. 



Spikelets panicled, drooping. Glumes broad, obtuse. 



Briza. 



Spikelets panicled. Flowering glumes compressed, 

 keeled, tips nerved, without awns. Poa. 



Spikelets very many flowered. Flowering glumes 

 convex, obtuse, tips without nerves or awn. Glyceria. 



Spikelets in racemes or spike-like panicles. Flower- 

 ing glumes convex, tip nerved, acute or with awn. Ovary 

 glabrous. Festuca. 



Spikelets many-flowered, in panicles. Flowering 

 glumes convex. Ovary tip villous. Bromus. 



Spikelets subsessile, distichous. Flowering glumes 

 convex. Ovary tip villous. Brachypodium. 



y8. Spikelets in two rows which approach one another 

 forming a unilateral spike or raceme with unjointed 

 axis. (For a see page 16.) 



Tribe 7. Chlorideae. Spikelets i -many-flowered. 

 Empty ghimes and paleae mostly 2-nerved. 



