EELATIONSHIPS WITH THE ELOKAS OF OTHEK BEGIONS. 



227 



allude specially to Southern California. We have not thought it worth while summarizing 

 the botany of California for the purposes of this work, because to do it properly would 

 involve a great expenditure of time ; but we have roughly counted the Californian 

 genera not represented in Mexico, and they amount approximately to 350, whereof 77 

 are peculiar. They consist largely of herbaceous plants, with additional genera of the 

 Coniferse and Cupuliferse ; the latter in the north. This number also includes a con- 

 siderable proportion of northern genera which reach their southern limit in this 

 State. The flora of Lower California is an extension from the north, and much less 

 like that of the opposite coast of Mexico. 



Extensions into South America and the West Indies. 



The expression " extensions into South America and the West Indies " is used in this 

 connection for convenience and to avoid ambiguity, though, strictly speaking, the exten- 

 sions are, as a rule, perhaps, rather in the opposite direction. Originally no attempt 

 was made to analyze the extensions into South America and the West Indies, the number 

 of species common to each and our flora being thought sufficient for the purpose ; but 

 the result was nothing definite, wherefore the accompanying Table was drawn up. Pos- 

 sibly the amount of information it conveys is hardly commensurate with the labour 

 bestowed upon it, because so much remains to be done in elaborating the details of the 

 distribution of species in the West Indies and the northern and eastern parts of South 

 America. Names rather than numbers would be more satisfactory in this case, and the 

 particulars given in the paragraphs specially devoted to the distribution of the principal 

 natural orders will be found more interesting. Reference to the Andine types which 

 reach Mexico is made in the chapter on the mountain vegetation. 



Proportional Distribution of Mexican and Central-American Species in South America 



and the West Indies. 





Common to 



both the West 



Indies and 



South 

 America. 



West Indies 

 only. 



Western 

 South 



America 

 only. 



Eastern 

 South 



America 

 only. 



Western and 



Eastern South 



America 



only. 



Numbers of South- 

 American types 

 reaching Mexico or 

 Guatemala, but not 

 the West Indies. 





190 



182 



97 



179 



55 



112 



43 



71 



3 



143 



129 



36 



64 



2 



66 

 65 

 30 

 99 

 1 



212 



80 



34 



103 



265 



177 



72 



183 



1 



Monocotyledones .... 



Totals 



648 



284 



374 



261 



429 



698 





biol. CENTE.-AMEB., Bot. Vol. IV., August 1887. 



2h 



