GRAMINEAE 



13 



Flowers (not outer glumes) long- 

 hairy at base. 

 Flowering glumes short-awnecl. 

 Flowering glumes not awned. 

 Flowers not long- hairy at base. 

 Flowering glume long-awned. 

 Awn very long, twisted. 

 Awn long, flexuose. 

 Awn very capillary. 

 Flowering glume not long-awned. 

 Spikelets flattened, bearing an 



awn Y^ long. 

 Spikelets not flattened and awn- 

 less. 

 Third scale longer than first. 

 Third scale shorter than first. 

 Panicle spike-like. 



Flowering glumes not awned. 



Glumes five, the third and fourth 



verj' small. 

 Glumes three. 



Empty glumes obliquely trun- 

 cate. 

 Empty glumes acute. 



Flowering glumes thinner than 



empty glumes. 

 Flowering glumes thicker than 

 empty glumes. 

 Flowering glumes awned. 

 Spikes compound. 

 Spikes simple. 



Glumes five ; sweet-smelling 



grass. 

 Glumes three ; not sweet smell- 

 ing. 



24. Calamagrostis. 



25. Calamovilfa. 



16. Stipa. 



18. Bkachyelytrum. 



26. Apera. 



B. 



Tall reeds with rachis and flowers long- vil- 

 lous. 

 Not tall reeds and rachis and flowers not 

 long-villous. 

 Flowering glume awned from the middle. 

 Spikelets less than 6'^ long. 

 Spikelets more than 6^^ long. 

 Flowering glume awnless or awned from 

 the apex. 

 Flowering glume toothed or lobed at 

 apex. 

 Spikelets stssile. 

 Spikelets pedicelled. 

 Flowering glume not toothed or lobed 

 at apex. 

 Flowering glumes 3-nerved. 



Glumes thick and coriaceous ; pan 



icle few-flowered. 

 Glumes not thick and coriaceous ; 

 panicles many-flowered. 



22. CiNNA. 



21. Sporobolus. 

 23. Agrostis. 



13. Phalaris. 



19. Phleum. 



21. Sporobolus. 

 17. Muhlenbergia. 

 17. Muhlexbergia. 



14. Anthoxanthum. 



20. Alopecurus. 



36. Phragmites. 



28. 

 29. 



38. 

 37. 



Trisetum. 



Avena. 



Diplachxe. 



SlEGLIXGIA. 



43. KORYCARPUS. 



