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Black maple - The Morton Arboretum
Acer nigrum - Wikipedia
Black Maple - US Forest Service Research and Development
Black maple (Acer nigrum) - Minnesota DNR
Acer saccharum subsp. nigrum (Black Maple) | North Carolina ...
Acer nigrum (Black Maple) - Minnesota Wildflowers
Black Maple - Natural Resource Stewardship
Black Maple Growing & Care - The Garden Magazine
Black maple (Acer nigrum) - Tree Canada
Acer nigrum Michaux f. — Black Maple - ngaflora.com