A historic American elm on the grounds of the Smithsonian National Museum of Natural History in Washington, D.C., has ...
American elm (Ulmus americana) and slippery elm (U. rubra), two of six species of elms found in North America, are known together as soft elms. Rock, winged, cedar and September elm are known as hard ...
A research specialist with the University of Vermont records information about young elm trees that have been inoculated with Dutch elm disease on May 19, 2026. Jessica Rinaldi / The Boston Globe via ...
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