26 



THE FIRST BOOK OF BOTANY. 



RATE (Fig. 20), DOUBLY SERRATE (Fig. 21), and UN- 

 EVENLY SERRATE (Fig. 22). 



FIG. 21. 



FIG. 22. 



Doubly Serrate. 



Unevenly Serrate. 



Look out for the same kinds of variation among 

 crenate margins. Fig. 23 shows you a FINELY ORE- 

 NATE margin. Doubly cre- 

 nate margins are very com- 

 mon. 



Dentate margins are 

 coarse, fine, double, and also 

 uneven. 



You will sometimes find 

 two kinds of margin on the 

 same leaf. Part of the notches may be serrate and 

 part dentate, and this forms a serrate-dentate margin. 

 If some of the notches are crenate and some serrate, 

 it will be crenate-serrate, and so on. 



In answering the new question, Margin ? which 

 you will find in the next schedule, you must look 

 closely, for all these different forms, and get familiar 

 with the terms by which they are described. 



Finely Crenate. 



