COMPARATIVE ANALYSIS. 



233 



4. Florets obscurely ribbed, panicle somewhat drooping 

 Florets five -ribbed, panicle not drooping . 



5. Ligules lanceolate 

 Ligules short and truncate 



6. Culm and sheath smooth, root creeping 

 Calm and sheath rough, root fibrous 



7. Ligules short and truncate, panicle somewhat drooping 

 Upper ligule oblong, acute, panicle not drooping 



8. Stein spreading, procumbent at the base 



Stem nearly erect .... 



TRIODIA. 

 Ligule, a tuft of hairs 



BRIZA. 



Glumes longer than the florets, ligule lanceolate 

 Glumes shorter than the florets, ligule very short 



DACTYLIS. 



CYNOSTJRTJS. 



Panicle secund . 



Spike ovate 

 Spike linear 



FESTTJCA. 



1. Glume one . 

 Glumes two 



2. Leaves auricled 

 Leaves not auricled 



3. Florets monandrous, shorter than their awns 

 Florets triandrous, awnless, or as long as their awns 



4. Culm leafy in its upper part 



Culm leafless above .... 



5. Raceme spiked . 



Panicle branched .... 



6. Lower leaves setaceous or involute, pedicels naked . 

 Leaves linear, pedicels tufts of hair at end 



7. Culm square, not a foot high 



Culm round .... 



8. Florets awned or pointed, edge of inner valve glabrous 

 Florets awnless, edge of inner valve downy 



9. Root fibrous .... 

 Hoot creeping .... 



10. Spikelets not more than five-flowered 

 Spikelets more than five-flowered 



5 

 6 



Laxa. 



Nemoralis. 



Pratensis. 



Trivialis. 



Nemoralis. 



8 



. Annua. 

 Alpina. 



Decwnbens. 



Minor. 



Media. 



Glomerata. 



Eclunvtus. 

 Cristatus. 



Uniglumis. 



2 



JBromus giganteus. 

 3 

 4 

 5 



. Myurus. 

 Bromoides. 

 Loliacea. 

 6 

 7 



10 

 8 

 9 



Vivipara. 



Duriuscula. 



Riibra. 



Calamaria. 



11 



