Swamp Cottonwood, Swamp Poplar, Black Cottonwood 



Populus heterophylla L. 



1. Portion of a twig i<lio\ving staminate 



aments x '^ 



2. A staminate flower, lateral view x 5 



rj. Portion of a twig showing pistillate 



aments x % 

 4. A pistillate flower, axile view x 5 



A twig showing mature leaves and fruit- 

 ing aments x M; 

 Mature capsule x 2 

 Comose seed x 3 

 Winter twig x y^ 



