, BY, E. C. ANDREWS. 543 



Combining these approximate results we have: — 



Eugenia with about 1,325 species. 



Myrcia with about 320 species. 



Eucalyptus with about 300 species. 



Myrtus with about 1 80 species. 



Psidium with about 140 species. 



Melaleuca with about 135 species, 



Calyptranthes with about 100 species. 



Ececkea with about SO species. 



Campomanesia with about 70 species. 

 The other genera are much smaller as regards numbers of 

 species. 



In Myrtaceae, there are approximately 3,100 species (Pflanzen- 

 familien, 1898, records about 2,750 species in Myrtaceae) of which 

 America (almost wholly tropical or subtropical) contains about 

 1,670, Australia about 800, Tropical Asia about 235, South Europe 

 1, Africa (mainly tropical) about 85, and the Pacific Islands, 

 together with the Indian Archipelago, about 310 species. Of these 

 3,100 species, Tropical and Subtropical America contain about 54 

 per cent., while Australia and the surrounding Islands contain 

 about 26 and 10 per cent, respectively. The fact that Europe con- 

 tains only one species (common also in Western. Asia) is most sig- 

 nificant, as is also the fact that North America probably contains 

 not more than 10 species. One genus alone, namely Eugenia, con- 

 tains about 43 per cent, of the total species, but less than 3 per 

 cent, of these occur in Australia. 



The fleshy-fruited genera are widely spread over the tropics, the 

 capsular genera are almost wholly Australian, while the Chamae- 

 laucieae are almost wholly West Australian. 



The Earlier Types of MYRTACEiE. 



Several factors need consideration in this connection. Principal 

 among these appear to be: — 



(a) The present distribution of the family. 



(b)The environment of present-day Myrtaceae. 



(c)The geography of the Cretaceous as compared with that of 

 the Tertiary and the present. 



