640 



METASPERMAE OF THE MINNESOTA VALLEY. 



From the table above it appears that the cosmopolitan gen- 

 era of the Monocotyledones, form a larger percentage of the 

 total Monocotyledones than do the cosmopolitan genera of the 

 other two taxonomic groups. Passing to the extratropical 

 genera, we find results similarly in line with those determined 

 from the families. 



Here it is to be noted that the extratropical percentage of 

 the Archichlamydeae exceeds the same percentage in the 

 other taxonomic groups. Continuing with the tropical and 

 subtropical element, the next table may be examined: 



An interesting variation from the results of family-examina- 

 tion is apparent in the table above. In the central realm ele- 

 ment the monocotyledonous influence is more distinct by 

 genera than is the metachlamydeous. By families, it will be 



