AMENTACE.-E 



377 



They are placed on a three-lobed scale formed by the 

 union of the main bract B and the pair of secondary 



Fig. 299. Fig. 300. 



Fig. 299. — Pair of fruits of Hazel, each in its involucre. 



Fig. 300. — Plan of arrangement of a male flower of Hazel. A, position of axis of 

 catkin ; B, bract subtending the flower ; u,, b, bracteoles. 



bracts a, b. Compared with the arrangement in the 

 female catkin, we may regard the single male flowers as 



Fig. 301. — Gorylus Amllana. 

 flower. 



Female 



Fig. 302.- 



■Corylus Avellana. Male 

 flower 



representing the lost median flower in the female group ; 

 in the male the lateral flowers are undeveloped. 

 The leaves are pubescent below. 



Salix (Willow) 



A vast genus, particularly in the north. The flowers 

 are dioecious, with half- concealed nectar, which is so 

 abundant that the trees are much visited by insects. 

 The' flowers are very variable. The stipules are per- 

 sistent or deciduous, and vary much in form. The 

 arrangement of the leaves of the Willow is very in- 

 structive. _ They are in spiral whorls, and so shaped 



