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 
yy 
7 
% 
wee 
gp ® 
To 
Fig. 17.—Stem of Water 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, 
