TREES AND SHRUBS. 



391 



differ from the ordinary branches in having the leaves arranged 

 in three rows instead of two. The bark remains smooth for 

 many years, and has narrow transverse lenticels ; in the older 

 parts it becomes rough and scaly. 



The leaves are stalked and simple. The blade varies in 

 form and amount of lobing, but has irregular pointed teeth 

 on the edge, a pointed tip, a rough surface, and is usually 

 larger on one side of the midrib than on the other, especially 

 at the base. 



The twigs of the current year are hairy and have a zigzag 

 appearance, the leaves (and buds) coming off singly at each 

 bend. The buds are egg-shaped but rather flat, and are 

 covered with brown scales ; within these come pairs of silky 

 stipules without leaf-blades, then stipules with young blades 

 between them, each leaf being folded along the midrib. 



VEGETATIVE 

 BUD 



SCARS 

 OF A BUD 



Fig. 157. Male and Female Inflorescence* 

 of the Hazel. 



BRACT'S 



Fig. 158. Hazel. 

 A, Male Flower ; B, Diagram of same. 



The uppermost bud on each twig grows out and forms a 

 long shoot, but in summer the end of the shoot dries up, then 

 the place of the lost end bud is taken by the uppermost side 

 bud. Most of the side buds, however, grow into dwarf shoots, 

 which may either bear a few leaves or may produce a male or 

 a female inflorescence. 



