COMPARATIVE ANALYSIS. 
Leaves involute, florets awnless 
2. Spike drooping, glumes longer than the florets 
Spike erect, glumes not longer than the florets 
Honrpevm. 
1. Glumes all setaceous . 
Glumes not all setaceous 
235 
2 
Geniculatus. 
Arenarius. 
Pratense. 
p, 
2. Glumes of lateral florets setaceous, of ere al floret lanceolate Murinum. 
Inner glumes of lateral florets not setaceous, 
setaceous 
TRITICUM. 
1. Spikelets unilateral 
Spikelets distichous 
2. Glumes and florets obtuse, fawees involute 
Glumes and florets awned or pointed, leaves flat 
3. Glumes scarcely ribbed, spikelets crowded 
Glumes ribbed, spikelets not crowded 
4. Root fibrous 
Root creeping 
BrachyPopium. 
Spike drooping, awns longer than the florets 
Spike erect, awns shorter than the florets 
Lorium. 
1. Spikelets much longer than the calyx 
Spikelets not longer than the calyx 
2. Florets with long rigid awns 
Florets with short soft awns 
Rorrse.itia. 
Glumes united 
Kwaprra. 
Root fibrous, florets very hairy 
SPARTINA. 
Florets very hairy 
Florets glabrous 
Cynopon. 
Florets glabrous, longer than the glumes 
Dierrarta. 
Leaves pubescent 
Leaves glabrous 
20 
the rest 
Maritimum. 
Loliaceum. 
2 
. Junceum. 
3 
Cristatum. 
+ 
. Caninum. 
Repens. 
Sylvaticum. 
Pinnatum. 
. Perenne. 
9 
Temulentum. 
Arvense. 
TIneurvata. 
Agrostidea. 
Stricta. 
Alterniflora. 
Dacetylon. 
Sanquinalis. 
Humifusa. 
