THE PARTS OF LEAVES 



27 



For example, observe that the bud -scales of the 

 common black currant gradually pass into leaves, 

 but the leaves are borne on the ends of scales ; 



FIG. 19. 

 Honeysuckle 



Black walnut. 



therefore, the scales must represent transformed 

 petioles, not transformed blades. The enlarged 

 and green bud -scales of the Norway maple are 



