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Black maple - The Morton Arboretum
Acer nigrum - Wikipedia
Black Maple - US Forest Service Research and Development
Black Maple - Acer nigrum - Maple-trees.com
Black maple (Acer nigrum) - Minnesota DNR
Black Maple Growing & Care - The Garden Magazine
Acer nigrum — black maple - Go Botany
Acer saccharum subsp. nigrum - Plant Finder - Missouri Botanical Garden
Acer saccharum subsp. nigrum - North Carolina Extension …
Black maple (Acer nigrum) - Tree Canada