WESTERN BLACK BIRCH 



if 4 



1. Winter twig, x 1. 



2. Staminate catkins, x 1. 



3. Leaf, x 1. 



4. Fruiting catkin, x 1. 



5. Pistillate flower, enlarged. 



6. Scale from fruiting catkin, enlarged. 



7. Winged fruit, greatly enlarged. 



(Original 



—74— 



