PLATE ii 



POPLARS 



1. Populus angustifolia: Narrowleaved Cottonwood 



2. Populus acuminata : Rydberg's Cottonwood 

 3. 5. Populus deltoides : Cottonwood 



4. Populus tremuloides : Aspen 



6. Populus balsamifera: Balsam Poplar 



