Ill 



TEMPERATE FLORAS 



33 



South African groups. Of course the mere submergence of 

 a large amount of lowlands would not, of itself, enable any 

 of its plants to invade the adjacent undisturbed land ; but 

 the subsidence would no doubt have been very slow, and 

 might have included the degradation of lofty mountains. 

 It would also be accompanied by a lowering of some of the 

 existing area. This would modify the climate in various 

 ways, leading probably to a higher temperature and more 

 moisture, thus giving more favourable conditions generally 

 for a great variety of plants. 



For easy reference it may be well to give here a table 

 showing the main facts as to these warm-temperate floras. 



Warm-Temperate Floras compared 

 Northern Hemisphere 



Temperate Floras of Smaller Areas compared 



We will now deal with a series of smaller areas (com- 

 parable to our counties) which I have been able to collect 

 from various parts of the world ; and I propose to arrange 



D 



