lo postelsia 



This short survey of these fundamental fac- 

 tors and conditions which have to do with plant 

 distribution in general, will perhaps suffice to 

 o-ive an idea of how thev obtain in the region 

 under consideration. It is then in line to con- 

 sider their bearing upon the floral development 

 in this limited designated area, with reference to 

 the organization and division of the ])lant com- 

 munitv into its most likely natural groupings 

 and formations, and tlien further to enter into 

 an analysis of the various associations with 

 respect to their present interdependence and 

 floristic composition rather than their historic 

 origin and development. 



B. plant SDistiibution nuD 3Daptation. 



A territorial rather than a biologic basis is 

 adopted for primary divisions and upon this 

 is built the classification of groupings and for- 

 mations which is thought best suited for the 

 manner of treatment pursued in this work. The 

 following synopsis will serve to give an idea of 

 the entire scheme. 



