(13) 



2. Holcus. — Spikelets 2-flowerecT, inferior 

 floret ^ , awnless; superior floret 5 , 

 aristate. 



3. Aira. — Spikelets 2-flowered, both ^ ; 

 inferior palea 4-dentate at its apex, aris- 

 tate from its base. 



4. Avena. — Spikelets 2- oo-flowered. Flor- 

 ets ^ . Inferior palea 2-dentate at its 

 apex, aristate from its median nerve. 



5. Danthonia. — Spikelets 2- oc-flowered. 

 Florets ^ . Inferior palea 2-cleft, aris- 

 tate from the fissure. 



6. Melica. — Spikelets 2- oo-flowered, florets 

 awnless, the inferior or 2 inferior, ^ ; 

 the rest rudimentary. 



7. Koeleria. — Glumte and paleae membrana- 

 ceous. Spikelets 2- oo-flowered. Flor- 

 ets lanceolate, compressed, carinate; 

 inferior palea mucronate-aristate. 



8. Dactylis. — Glumie and palece herba- 

 ceous. Spikelets 8- oc-flowered. Flor- 

 ets ovate, carinate. Inferior palea 

 asymmetric, mucronate-aristate. 



9. Poa. — Spikelets 2- oo-flowered. Florets 

 ovate, carinate, awnless, deciduous with 

 the joint of the axis. 



10. Eragrostis. — Spikelets 2- oo-flowered. 

 Florets ovate, carinate, awnless; supe- 

 rior palea and axis persistent. 



