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Notes on Plant Distribution in Southern California, U. S. A. 



By 

 R. E. B. McKenney. 



With 7 figures. 



Introd uction. 



But few of the United States show such a diversity of topo- 

 graphy and climate as California. Not onlj does the northern 

 half of the State diflFer from the southern, but these parts are each 

 diviiible into a number of regions. In this preliminary paper, 

 I wish to treat briefly of part of one of these regions, namely 

 Orange County. 



The Coast Range of mountains with a general trend from 

 northwest to southeast divides southern California into two main 

 divisions. The eastern 

 section, largely oceu- 

 pied by the wohave 

 Desert, is a typical 

 xerophile district. The 

 western section is a 

 more fertile region, 

 not ouly supporting a 

 large population, but 

 furnishing large quan- 

 tities of oranges and 

 other fruits for the 

 Eastern States and 



Europe. Orange 

 County is situated in 

 his western section, 

 and has an area of 

 740 sq. miles. Its 

 location will be made 

 out from flg. 1. 



The Santa Ana Mts., 

 one of the chains 

 of the Coast Range, 



Fig. 1. Diagram of Southern California showing 

 location of Orange County; 1 = Santa Ana Mts.; 

 2 = San Jacinto Mts., 3 ^= San Bernardiuo Mts. 



