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COMPARATIVE ANALYSIS. 



1. Upper leaf much shorter than its sheath 

 Upper leaf about equal in length to its sheath 



2. Awn projecting more than half its length beyond floret 

 Awn projecting not more than a third beyond floret . 



3. Awn projecting half its length beyond floret . 

 Awn not projecting beyond floret ... 



PHLEITM. Glumes awned 



Glumes acute, not awned ... 



1. Awn not half the length of glume . . 

 Awn more than half the length of glume . . 



2. Floret not half length of calyx . . 

 Floret more than half length of calyx . . 



PHALABIS.' Base of floret with two membranous valves 



Base of floret with two hairy valves . . 



Alpinus. 



Pratensis. 



Oeniculatm. 



. Fulwus. 



. 



Pratense. 



Alpinum. 



Arenarium 



Michelii. 



Canariensis. 

 Arundinacea. 



. Glumes of middle spikelet fringed . . Murinum. 



Glumes of middle spikelet not fringed 



1. Inner glume of lateral spikelet very much dilated on one side Maritimum. 



Glumes not dilated . . Pratense 



AGEOSTIS. Ligule of upper sheath very short 



; Ligule of upper sheath long 

 1. Floret of two palese, sheaths roughish 

 Floret of one palea, sheaths smooth 



CALAMAGBOSTIS. Hairs shorter than floret 

 Hairs longer than floret 



MELICA. Calyx with one floret and rudiment of second 

 Calyx with two florets and rudiment of third . 



MOLINIA. Outer palea five-ribbed 



Outer palea three-ribbed . 



HOLCUS. Awn of floret smooth 

 Awn of floret rough 



AIEA. Awns not protruding beyond the florets . 



Awns protruding considerably beyond the florets 



1. Awn arising from little above base of palea 



Awn arising from little above centre of outer palea 



2. Sheath of leaf rough from above downwards 

 Sheath of leaf rough from below upwards 



3. Panicle spreading 



Panicle close .... 



ATENA. Florets with two long bristles at summit 

 Florets without bristles at summit 



. Vulgaris. 

 1 



Alia. 

 Canina. 



Stricta. 

 Epigejos. 



. TIniflora. 

 Nit tans. 



Depauperata. 

 Ccerulea. 



. Lanatus. 

 Mollis. 



1 



2 



Catxpitosa. 



Alp ma. 



. Flexuosa. 



3 



Caryophillea. 

 Praecox. 



Strigosa. 

 Fatua. 



