112 



HOW PLANTS CLIMB 



sweet or wax- work Ccelastrus), some honeysuckles, wis- 

 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, 



231. Each kind of plant usually coils in only one 



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



direction. Most plants coil against the sun, or from the 

 observer's left across his front to his right as he faces the 

 plant. Such plants are said to be dextrorse (right-handed) 

 orantitropic (against the sun). Examples are bean, morn- 

 ing-glory. The hop twines from the observer's right 

 to his left. Such plants are sin^'strorse (left-handed) or 



