LEAF-FORMS AND FIQUKES. 



19 



LESSON IV. 



FORMS AND FIGURES OF LEAVES. 



19. In many kinds of leaves we find the parts at the base 

 more or less enlarged backwards, as yon see in this picture 



Fig. 22. The Morning-glory. 



of the Morning-glory leaf (Fig. 22). This is the lieart- 

 ghaped, or, more properly, the cordate leaf. It is truly an 



