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 
