CLIMBING AND WATER PLANTS 119 



of them are still amphibious, and are able 

 to respond to the stimulus of either land 

 or watery surroundings by a suitable struc- 

 ture. For example, the common Moneywort 



Fig. 17. Stem of Watei Milfoil (Myriophyllum) in transverse 

 section. A, airspace; VS, vascular strand. 



(Lysimachia Nummularia) of wet meadows 

 will grow as an aquatic, a marsh plant, or 

 as an inhabitant of dry soil. The reason 

 of this is to be sought in the way in which 

 the development of the cuticle is affected, 



