(13) 



2. Holcus. Spikelets 2-flowered, inferior 

 floret , awnless; superior floret <3 , 

 aristate. 



3. Aira. Spikelets 2-flowered, both $ ; 

 inferior palea 4-dentate at its apex, aris- 

 tate from its base. 



4. Avena. Spikelets 2- co-flowered. Flor- 

 ets $ . Inferior palea 2-dentate at its 

 apex, aristate from its median nerve. 



5. Danthonia. Spikelets 2- co-flowered. 

 Florets Q . Inferior palea 2-cleft, aris- 

 tate from the fissure. 



6. Melica. Spikelets 2- co-flowered, florets 

 awnless, the inferior or 2 inferior, ; 

 the rest rudimentary. 



7. Koeleria. Glunue and paleas membrana- 

 ceous. Spikelets 2- co-flowered. Flor- 

 ets lanceolate, compressed, carinate; 

 inferior palea mucrouate-aristate. 



8. Dactylis. Glum as and pale 03 herba- 

 ceous. Spikelets 3- co-flowered. Flor- 

 ets ovate, carinate. Inferior palea 

 asymmetric, mucronate-aristate. 



9. Poa. Spikelets 2- co-flowered. Florets 

 ovate, carinate, awnless, deciduous with 

 the joint of the axis. 



10. Eragrostis. Spikelets 2- co-flowered. 

 Florets ovate, carinate, awnless; supe- 

 rior palea and axis persistent. 



