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Betulaceae
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Betula
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Betula papyrifera
Betula papyrifera
A. A. Reznicek
bark
L. Wallis
J. Kelly
L. Wallis
mature trunk
R. Schipper
R. Schipper
catkins
R. Schipper
D. Drife
bracts
D. Drife
seeds
ex W. H. Wagner slide collection
ex W. H. Wagner slide collection
ex W. H. Wagner slide collection