116 



HOW PLANTS CLIMB 



taria, Dutchman's pipe, dodder. The free tip of the twining 

 branch sweeps about in curves, much as the tendril does, 

 until it finds support or becomes old and rigid. 



243. Each kind of plant usually coils in only one direction. 

 Most plants coil against the sun, or from the observer's 



178. Clematis climbs by means of its leaf-stalks. 



left across his front to his right as he faces the plant. 

 Such plants are said to be antitropic, or to move against 

 the sun from the position in which the observer stands. 

 Examples are bean, morning-glory. The hop twines from 

 the right to his left; such plants are eutropic (with the sun). 

 Fig. 179 shows the two directions. 



