B. alba - branch w catkin RK
B. alleghaniensis KS
B. alleghaniensis - Yellow birch in fruit MC
B, lutea in enthesis RK
B. nigra bark DW
B. papyrifera - Catkin RK
B papyrifera - Male female inflr MC
B. pendula - Bark RK
B. pendula - Male & female DW
B. pendula - Tree RK
B. pendula - Trunk RK
B. pumila - catkins KS
B. pumila -Catkin detail KS
B. pumila -Habitat KS
Betula armanii DW
Birch subclimax DW