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- The American Elm cultivar Ulmus americana 'Jefferson' was cloned from a tree growing near a path in front of the Freer Gallery of Art, close to the Smithsonian Institution Building ("The Castle") on the National Mall in Washington, D.C. The United States National Park Service, which had planted the tree during the 1930s, cloned it in 1993 after screening tests showed that it possessed an outstanding level of tolerance to Dutch elm disease (DED). In 2005, the Park Service and the Agricultural Research Service (ARS) of the United States Department of Agriculture jointly released the clone (formerly NPS 3–487) to the nursery trade as 'Jefferson'. The parent tree appears to have remained unscathed by DED in 2014. (en)
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- 16907 (xsd:nonNegativeInteger)
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- The original 'Jefferson' elm on the National Mall in Washington, D.C. (en)
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- Ulmus americana 'Jefferson' (en)
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- National Park Service, US (en)
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- The American Elm cultivar Ulmus americana 'Jefferson' was cloned from a tree growing near a path in front of the Freer Gallery of Art, close to the Smithsonian Institution Building ("The Castle") on the National Mall in Washington, D.C. The United States National Park Service, which had planted the tree during the 1930s, cloned it in 1993 after screening tests showed that it possessed an outstanding level of tolerance to Dutch elm disease (DED). (en)
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- Ulmus americana 'Jefferson' (en)
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- Ulmus americana 'Jefferson' (en)
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