96 



ELEMENTS OF BOTANY. 



pair below it, and sometimes in the lengthening of the lower 

 petioles so as to bring the blades of the lower leaves outside 

 those of the upper leaves. Examination of Fig. 80 will make 

 the matter clear. 



The student should not fail to study the leafage of several 

 trees of different kinds on the growing tree itself, and to 



Fig. 81. —Opposite Leaves of Deutzia i (from the same shrub as Fig. 82), aa 

 arranged on horizontal branch. 



notice how circumstances modify the position of the leaves. 

 Maple leaves, for example, on the ends of the branches are 

 arranged much like those of the horse-chestnut, but they are 

 found to be arranged more nearly flatwise along the inner 

 portions of the branches, that is, the portions nearer the tree. 



1 Deutzia crenata. 



