CLASSIFICATION OF PLANT COMMUNITIES 319 



The classification of associations. In classifying plant associa- 

 tions, they should first of all be grouped with reference to the 

 developmental relations of the habitats concerned; in other 

 words, with reference to the successional relations of the associa- 

 tions themselves The further classification of the association- 

 complexes thus defined is discussed in subsequent paragraphs. 



(To he continued.) 



