Fig. 393: a-e, Betula nigra: a, tip of branch, x V->\ b. leaf, x i{;; c, pistillate catkin, 

 X 2i{>; d, nutlet with bract, x 2^'->\ e. bract, x 2'1.. f-j. Betula occidentalis: f, tip of 

 branch, x V-s, g, pistillate catkin, x 2'/.; h, nutlet with bract, x 2Uy, i, bract, x 2V>; j, 

 nutlet, X 21/2. (V. F.). 



