DESCRIPTIONS OF TRIBES AND GENERA. 141 



<] <] Spikelets not at all or 

 only slightly compressed ; 

 glumes not keeled. 

 X Stamens three ; lodi- 

 cule one ; upper sterile 

 glumes usually club- 

 shaped. . 235. Melica. 

 XX Stamens 1-2; lodi- 

 cules two ; sterile 

 glumes not club- 

 shaped. 236. Diarrhena. 



NOTE. Compare Streptogyne. 



*** Flowering glumes five- to many- 

 nerved ; each containing a S flower, 

 or the upper with only a $ flower 

 or empty (very rarely in many 

 Festuca and Bromus species there 

 are several empty glumes above 

 the fertile; in Zeugites there are 

 several $ flowers and only one ). 

 t Leaves broad, lanceolate or 

 ovate, with fine transverse veins 

 between the longitudinal nerves. 

 O Spikelets one-, rarely two- 

 flowered. 



<] Spikelets in a long uni- 

 lateral raceme ; stigmas 

 very long and spiral. 



242. Streptogyne. 



< < Spikelets in several short 



spikes which are united 



in pairs along the axis of 



a panicle. 



241. Poecilostachys. 

 < <] <] Spikelets paniculate. 



239. Orthoclada. 

 O O Spikelets many-flowered. 

 < All the flowers $ . 



237. Cenototheca. 



