GRAMINEAE 



13 



Flowers (not outer glumes) long- 

 hairy at base. 



Flowering glumes short-awned. 

 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. 

 Spikeleta flattened, bearing an 



awn \ /f 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 



very 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. 



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 s< ssile. 

 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. 



24. CALAMAGROSTIS. 



25. CALAMOVILFA. 



16. STIPA. 



18. BRACHYELYTRUM. 



26. APERA. 



22. CINNA. 



21. SPOROBOLUS. 

 23. AGROSTIS. 



13. PHALARIS. 



19. PHLEUM. 



21. SPOROBOLUS. 

 17. MUHLENBERGIA. 

 17. MUHLENBERGIA. 



14. ANTHOXANTHUM. 



20. ALOPECURUS. 



36. PHRAGMITES. 



28. 

 29. 



38. 

 37. 



TRISETUM. 

 AVENA. 



DlPLACHNE. 

 SlEGLINGIA. 



43. KORYCARPUS. 



