Explanation of Terms. 



239 



Fig. b. 



Fig. c. 



III. 



The Edge of the leaf is : 



(1) Entire, when it is an even line, without indenta- 

 tions. 



(2) Toothed, when it is set with an indefinite number 

 of sharp or blunt teeth. (Fig. d.) 



Fig. J. 



(3) Lobed, when the indentations are deep and of a 

 definite number. (Figs, e, f, and^, Oaks and Poplar.) 



IV. 



The Shape of the Whole Leaf. — The leaf is : 

 (1) Needle- or line-shaped, when it is very narrow (some- 

 times no more than a line), and of about the same width 

 throughout. (Fig. //, Pine.) 



