56 KEY TO GENERA AND SPECIES 



Branches closely ascending. Leaves com- 

 monly broader than long. Cult, and es- 

 caped. Native in Asia. (Fig. 97.) Lom- 

 bardy Poplar, Populus nigra var. italica 

 Du Roi. 



102. Crown of the tree not spiry 103. 



103. Young twigs smooth. Western New England 





Fig. 99. Carolina Poplar. 



southward and westward, also cult. (Figs. 

 98, 99.) Carolina Poplar, Cottonwood, 

 Necklace Poplar, Cotton-tree, Populus del- 

 toides Marsh. 



