﻿Paper Birch, Canoe Birch, White Birch 



Betula alba, var. papyrifera (Marsh.) Spach. [Betula papyrifera Marsh.] 



1. A twig showing pistillate and staminate 



aments x % 



2. Bract and bracteoles from staminate ament 



showing stamens, distal view x 7 



3. Staminate flowers with subtending bracts 



and sepals, axile view x 7 



4. Bract and bracteoles from pistillate ament 



showing styles, abaxile view 15 



5. Pistillate flowers with subtending bracts, 



axile view x 15 



6. A twig showing mature leaves and fruit- 



ing strobiles x % 



7. Scale from fruiting strobile x 4 



8. Winged nutlet x 4 



9. Winter twig x % 



