KEY TO GENERA AND SPECIES 69 



in. Bark dark colored, not sepa- 

 rable into thin papery lay- 

 ers. Young twigs strongly 

 spicy-aromatic when the 

 bark is bruised or broken. 

 Western Me. southward 

 and westward. (Figs. 119, 

 120.) Black Birch, Cherry 

 Birch, Sweet Birch, Betula 

 lenta L. 



in. Bark light colored (usually 

 white, yellowish, or pink- 

 ish), rarely dark, except in young trees; 



Birch 



Black 



Fig. 120. Black Birch. Old trunk. 



generally separating, or separable, on me- 

 dium sized trunks, into thin papery lay- 

 ers 112. 



