714 METASPERMAE OF THE MINNESOTA VALLEY. 



D. Table Illustrating General Continental Range 



Crepis runcinata. 



Hieracium venosum . , 

 Hieracium canadense , 



Prenanthes crepidinea. 



Hieracium longipilum . 

 Hieracium venosam. . 



Before proceeding with the range statistics, a table of gen 

 eral statistics is herewith presented: 



The larger average per cent, of species to the genus in the 

 Monocotyledones is due to the influence in that group of the 

 genus Carex, among other conditions. In addition, the general 

 dispersion which has been supposed to mark the taxonomic 

 group of the Monocotyledones in particular, has doubtless its 

 influence on the average number of species per genus. Passing 

 next to the statistics condensed from Table D, we isolate first 

 the four principal range elements. These are : 



(1) The Nortliern Specific Elciuerit. 



(2) The Southern Specific Element. 



(3) The Eastern Specillc F^leiuent. 



(4) The Western Specific Element. 



