THE LEAF. 



5 



When the teeth are sharp, without pointing in any par- 

 ticular direction, they form a dentate margin (Fig. 5) ; or, 



FIG. 12. 



FIG. 13. 



FIG. 14. 



when again similarly toothed, the margin is bidentate (Fig. 

 i&c)- When the teeth are rounded (Fig. n), the margin 

 is crenate j if twice rounded, as in Fig. 13, a, it is bicrenate. 



FIG. 15. 



FIG. 16. 



FIG. 17. 



Margins like the one shown in Fig. 14 are said to be 

 crisped, or curled. When like Fig 15, they are said to be 



wavy, or undulated. 



