PLATE XXXVII. BLACK WALNUT. 



1. lU-fiiieli witl) developing loaves and (s) tbree sclitary catkins of staniinate flowers and (p) 



a si)ike with three pistillate flowers, x h. 



2. A staniinate flower, slightly enlarged. 



3. A pistillate flower, slightly enlarged. 



4. A branch Avith a mature leaf and fruit, x I. 



5. A winter twig, x I. 



6. Longitudinal section of twig showing chambei'ed pith, enlarged. 



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



scars and notched upper surface, slightly enlarged. 



8. A nut with liusk removed, x |. 



9. Terminal section of winter twig showing leaf-scar and terminal bud with bud-scales, slightly 



enlarged. 



