E. V. Wulfif 



—42- 



Historical Plant Geography 



Range in N. Z. 

 (miles) 

 881-1080 

 641- 880 

 401- 640 

 i6i- 400 

 I- 1 60 



Endemics 



112 



120 

 184 

 190 

 296 



WiDES 

 201 



77 

 53 

 38 

 3°* 



Fig. 4. — Areas of species of different ages, the most ancient species occupy the 

 largest areas: species of the genus Haaslia {Compositae) in New Zealand. (After 

 Willis). 



The widely held view that endemic species are either relics ap- 

 proaching extinction or species that have arisen as a result of adapta- 

 tion to local conditions cannot explain the fact of gradual gradation in 

 the areas occupied both by endemics and by wides, the first from many 



* Largely undoubted introductions of recent years. 



