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PLATE XXI. BLACK SPRUCE. 



1 Braneb nitb pistillate flowers, x *. 

 ;'. Brancb with staininate flowers, x I. 

 3. Branch with needles and coned, x i. 

 I. A cone-scale with two winged seeds, s i. 



5. A wing:ed seed, natural size. 



6. A seed, enlarged. 



7. Terminal portion of a twig with buns and without ueedles, enlarged. 



8. A seedling, natural size. 



