KEY TO GENERA AND SPECIES 71 



112. Papery or filmy bark yellowish, silvery-gray, 

 or straw-color, and usually shining. Bark 

 of young twigs spicy-aromatic when bruised. 

 Newfoundland westward and southwest- 

 ward. (Figs. 121, 122.) Yellow Birch, 

 Silver Birch, Betula lutea Michx. f . 



River Birch. Young trunk. 



112. Papery or filmy bark varying from chalky- 



white or pink to bronze. Bark of young 

 twigs not distinctly spicy-aromatic when 

 bruised 113. 



113. Papery bark pinkish or salmon-colored, usu- 



ally separating naturally into filmy coils or 



