714 METASPERMAE OF THE MINNESOTA VALLEY. 



D. Table Illustrating General Continental Eange 



NORTHERN. 



SOUTHERN. 



Lygodesmia juncea 



Prenanthes alba 



Prenanthes racemosa 



Crepis runcinata, 



Hieracium venosum. 

 Hieracium canadense 



Adopogon virgimcum . . 



Lygodesmia juncea 



Prenanthes serpentaria 



Prenanthes alba 



Prenanthes aspera 



Prenanthes racemosa. . . 

 Prenanthes crepidinea. . 



Hieracium longipilum 

 Hieracium venosum. 



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 Northern Specific Element. 



(2) The Southern Specific Element. 



(3) The Eastern Specific Element. 



(4) The Western Specific Element. 



