COMPAEATrVE ANALYSIS. 



233 



4. Florets obscurely ribbed, panicle somewhat drooping 

 Morets five -ribbed, panicle not drooping . 



5. Ligules lanceolate 

 Ligules short and truncate 



6. Culm and sbeatb smooth, root creeping 

 Culm and sheath rough, root fibrous 



7. Ligules short aijd truncate, panicle somewhat drooping 

 Upper ligule oblong, acute, panicle not drooping 



8. Stem spreading, procumbent at the base 



Stem nearly erect .... 



Teiodia. 

 Ligule, a tuft of hairs 



Briza. 

 Glumes longer than the florets, ligule lanceolate 

 Glumes shorter than the florets, ligule vciy short 



5 

 6 

 Laxa. 



Nemoralis. 



Trwialis. 

 Nemoralis. 



8 

 . Annua. 

 Al^nna. 



Decumhens. 



Minor. 



Dactylis. 



Cynosttetts. 



Panicle secund . 



Spike ovate 



Spike linear .... 



Festttca. 



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. Eaoeme 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 valvo glabrous 

 Florets awnless, edge of inner valve downy 



9. Eoot fibrous . . . • 

 Eoot creeping . . . • 



10. Spikelets not more than five-flowered 

 Spikelets more than five-flowered 



Glomerata. 



Echinitus. 

 Cristatus. 



Uhiglmnis. 

 2 

 Bromus giganteus. 

 3 



5 



. Myurm. 



Bromoides. 



Loliacea. 



6 



7 



10 



8 



9 



Ovina. 



Vivipara. 



Duriuscula. 



Eitbra. 



Calamaria. 



11 



