|Acer nigrum natural range|
Identification can be confusing due to the tendency of the two species to form hybrids. The simplest and most accurate method for distinguishing between the two trees is the generally three-lobed leaves of the black maple versus the generally five-lobed leaves of the sugar maple. The leaves of the black maple also tend to have a "droopy" appearance. Other differences that are not as pronounced include darker, more deeply grooved bark, slightly smaller seeds, and thicker petioles. Hybrids are intermediate in their characteristics.
The geographic range of A. nigrum is slightly more limited than the sugar maple, encompassing much of the Midwestern United States, portions of the Eastern United States, and the southeast of Canada in southern Ontario.
The black maple's mature height ranges from 21 to 34 meters (70 to 110 feet).
- "Acer nigrum". IUCN Red List of Threatened Species. Version 2019.1. International Union for Conservation of Nature. 2019. Retrieved 16 June 2019.
- "Acer nigrum". Natural Resources Conservation Service PLANTS Database. USDA.
- "Acer saccharum subsp. nigrum". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 2017-12-20.
- "Acer nigrum Range Map" (PDF). United States Geological Survey. Archived from the original (PDF) on 2008-05-09. Retrieved 2008-03-06.
- "USDA Forest Service Guide to Black Maple". USDA Forest Service. Retrieved 2014-08-24.
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