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Betulaceae
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Alnus
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Alnus incana
Alnus incana
R. W. Smith
R. Schipper
R. Schipper
branch
R. Schipper
R. Schipper
R. Schipper
R. Schipper
G. E. Crow
catkins
G. E. Crow
catkins
G. E. Crow
cones
G. E. Crow
habit
G. E. Crow
subsp. rugosa
A. A. Reznicek
staminate catkin buds
ex W. H. Wagner slide collection
staminate flowers
ex W. H. Wagner slide collection
female flowers