PLATE XXI. BLACK SPRUCE. 



] Branch with pistillate flowers, x J. 

 ','.. Branch with staminate flowers, x J. 

 3. Branch with needles and cones, x 1. 

 t. A cone-scale with two winged seeds, x J. 

 r>. A winged seed, natural size. 



6. A seed, enlarged. 



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



8. A seedling, natural size. 



