COMPABATIYE ANALYSIS. 



235 



Leaves involute, florets awnless . . .2 



2. Spike drooping, glumes longer than the florets . Geniculatus. 



Spike erect, glumes not longer than the florets Arenarius. 



HOEDEUH. 



1. Glumes all setaceous .... Pratense. 

 Glumes not all setaceous . . . .2 



2. Glumes of lateral florets setaceous, of central floret lanceolate Murinum. 

 Inner glumes of lateral florets not setaceous, the rest 



setaceous Maritimum. 



TEITICUM. 



1. Spikelets unilateral 

 Spikelets distichous 



2. Glumes and florets obtuse, leaves involute 

 Glumes and florets awned or pointed, leaves flat 



3. Glumes scarcely ribbed, spikelets crowded 

 Glumes ribbed, spikelets not crowded 



4. Boot fibrous .... 

 Boot creeping 



BRACHYPODIUM. 



Spike drooping, awns longer than the florets 

 Spike erect, awns shorter than the florets 



LOLIUM. 



1. Spikelets much longer than the calyx 

 Spikelets not longer than the calyx 



2. Florets with long rigid awns 

 Florets with short soft awns 



BOTTECELLIA. 



Glumes united 



KNAPPIA. 



Eoot fibrous, florets very hairy 



Florets very hairy 

 Florets glabrous 



SPARTINA. 



CYNODON. 

 Florets glabrous, longer than the glumes 



DIGITARIA. 

 Leaves pubescent 

 Leaves glabrous 



Loliaceum. 

 2 



. Junceum. 



3 

 Cristatum. 



4 



. Caninum. 

 Repens. 



Sylvaticum. 

 Pinnatum. 



. Perenne. 



2 



Temulentum. 

 Arvense. 



Incurvata. 

 Agrostidea. 



. Stricta. 

 Alterniflora. 



Dactylon. 



Sanguinalis. 

 Humi/usa. 



2.O 



