300 THE BIOLOGY OF FLOV/ERING PLANTS 



tendril. Examples are the leaf blades of Corydalis clavi- 

 ciilata, the leaf-stalks of Tropceolum sps., the stalks of the 

 leaflets of Clematis sps. Next to these we may place the 

 liliaceous Gloriosa, in which the leaf tip is prolonged into a 

 tendril. In Nepenthes the same thing is seen, though, 



Fig. 44. — Shoot tendrils : i,Adenia; 2, Lagenaria. Nat. size. 



most frequently, the presence of the pitcher complicates 

 matters. In the sweet pea and many vetches the branched 

 tendrils represent several of the apical leaflets and their 

 stalks. In Lathyrus Aphaca the whole leaf forms the tendril, 

 the leaf function being taken over by the enlarged stipules. 

 The tendrils of Smilax occupy the position of stipules, though 



