120 



THE VEGETATIVE ORGANS 



leafy branches and notice the variations in different plants. 

 In some trees, like the Sycamore, Horse-Chestnut, and Pine, 

 the terminal bud continues the growth of the main axis 

 from year to year. A single and continuous axis is called 



Fig. 78. Branch of Willow. d, dead terminal bud. 



a monopodium. In most trees, however, growth is not 

 so uniform ; usually the end bud dies and the lateral 

 bud arising in the axil of the next leaf below enlarges, 

 pushes the withered bud aside, and appears to be the terminal 

 one. A careful study of the Elm twig (Fig. jj) will make 

 these points clear. In the following spring this lateral 



