River Birch, Red Birch, Black Birch 



Betula nigra L. 



1. A twig showing pistillate and staminate 



aments x 1 



2. Bract and bracteoles from staminate 



ament showing stamens, distal view x 8 



3. Staminate flowers with subtending bracts 



and sepals, axile view x 8 



4. Bract and bracteoles from pistillate 



ament showing styles, abaxile view x 6 



5. Pistillate flowers with subtending bracts, 

 axile view x 6 



G. A twig showing mature leaves and fruit- 

 ing strobiles x % 



7. Scale from fruiting strobile, abaxile view 



X 2 



8. Winged nutlet x 4 



9. Winged twig x % 



