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 



