Betula nigra L.  
Family: Betulaceae
River Birch,  more...
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Morton Arboretum  
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Morton Arboretum  
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Morton Arboretum  
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Steve Hurst  
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W.D. Brush  
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Steven J. Baskauf  
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W.D. Brush  
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Steven J. Baskauf  
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Drew Avery  
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W.D. Brush  
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Steven J. Baskauf  
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The National Science Foundation
This project made possible by National Science Foundation Award 1410069