Cottonwood 



1. Winter twig, x i. 



2. Leaf, x y 2 . 



3. Staminate flowering branchlet, x 



4. Staminate flower,, enlarged. 



5. Pistillate catkin, x */ 2 . 



6. Pistillate flower, enlarged. 



7. Fruit, x Y 2 . 



56 



