PLATE XXI. BLACK SPRUCE. 



] Brancli v.itli pistillate fiowers, x |. 



Branch with staminate flowers, x J. 

 3. Branch with needles and cones, x i. 

 1, A cone-scale with two winged seeds, x i. 



5. A winged seed, natural size. 



6. A seed, enlarged. 



7. Terminal portion of a twig with buas and without needles, enlarged. 



8. A seedling, natural size. 



