RYDBERG'S COTTONWOOD 



q 

 o. 



4. 

 5. 

 6. 





Winter twig, x 1. 

 Leaf, x 1. 



Staminate catkin, x 1. 

 Young fruiting catkin, x 1. 

 Staminate flower, enlarged. 

 Pistillate flower, enlarged. 

 (Original) 



—52— 



