PLATE XXXVII. BLACK WALNUT. 



1. rir.Tiicli with (ltvel')i>inL' Icavi's and (s) Tlirt-c si litniy catkins «.f staiuinate flowers and (p) 



a spike witli three pistillate flowers, x S. 



2. A staininale flower, slightly enlarged. 



3. A pistillate flower, slightly enlarged. 



4. A branch with a mature leaf and fruit, x *. 



5. A winter twig, x i. 



6. Longitudinal section of twig showing chambered pith, enlarged. 



7. Section of twig showing superposed and gaping buds, and leaf-scars with 3 clusters of bundle- 



sears and notched upper surface, slightly enlarged. 

 S. A nut with husk removed, s I. 



9. Terminal seclii/n uf winter twig showing leaf-scar and terminal bud with bud-scales, slightly 

 . enlarged. 



