KEY TO GENERA AND SPECIES 



75 



117. Leaves broadly egg-shaped, heart-shaped at 



base. Newfoundland to northern 

 New England and 

 northward. (Figs. 

 131, 132). Cordate- 

 leaved Birch, Betula 

 alba var. cordifolia 

 Fig. i 33 Eu- (Regel) Fernald. 



ropean Paper 

 Birch. 



118. Leaves i| to 2\ inches long. 



Newfoundland and northern 



New England and north- Fi s- *34- Ameri- 

 can Canoe Birch, 

 ward, also cult. (Fig. 133.) 



European Paper Birch, Betula alba L. 



Fig. 135. American Canoe Birch. 



118. Leaves 2\ to 3^ inches long. Newfound- 

 land to Penn., thence westward across the 



