PLANT ASSOCIATIONS 327 



(3) Mesophytes. Between the two extremes of the wa- 

 ter-supply there is a great middle region of medium water- 

 supply, and plants of these medium conditions are meso- 

 phytes ("medium plants"). It is evident that mesophytes 

 pass gradually into hydrophytes on the one side and into 

 xerophytes on the other. 



22 



