644 ON THE MYRTACE.E OF AUSTRALIA, 



The following genera with one or two exceptions, are limited to 

 Western Australia : — 



Actinodium. 



Verticorda (except one species in N. Australia). 



Pileanthus. 



Lhotzkya (except two in S. Australia and one in Victoria). 



Wehlia. 



Astartea. 



Uypocalymma. 



Balaustion. 



Agonis (except one in Queensland). 



Conothamnus. 



Beaufortia. 



Regelia. 



Phymatocarpus. 



Calothamnus, 



Lamarkea. 



Eremcea. 



Sir Joseph Hooker, in referring to the primitive character of the 

 Western Flora, remarks : — " That no natural order, but that many 

 Genera, and a whole Flora of species, should be created in the 

 smaller and more isolated area of Western Australia, different 

 from what Eastern Australia presents, seems at first sight favour- 

 able to the idea that these derivative Genera and species were 

 formed during the gradual migration of certain orders and Genera 

 of the East towards the West. But, on the other hand, this 

 mussing of most of the peculiar features of the Australian Flora in 

 the West, unmixed there with Polynesian, Antarctic, or New 

 Zealand Genera, is an argument for regarding Western Australia 

 as the centrum of Australian Vegetation, whence a migration 

 proceeded eastward ; and the eastward Genera and species must in 

 such a case be regarded as derivative forms." These considerations 

 of a quarter of a century since have received additional illustration 

 from the labours of Mr. Bentham and Baron Mueller, who now 

 show, that, in the great order of the Myrtaceae alone, Western 



