Acer nigrum F. Michx.
Common Name: BLACK MAPLE
Synonym: Acer saccharum
Coefficient of Conservatism: 4
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt Tree

Included in A. saccharum in Michigan Flora.

Most typically a species of floodplains, but also in moister lowland settings, mostly on calcareous soils; less often in drier sites and uplands.

Black maple is often recognized as a distinct species, but we do so here with trepidation. Plants in the field in the southern half of the Lower Peninsula are distinctive, not only in their pubescent foliage, but also in their more rounded leaf lobing, “drooping” rather than flat leaves, and usually yellow fall color. Even relatively large trees have paler, sometimes even grayish-white bark more finely patterned than that of Acer saccharum. In the herbarium, distinctions are more difficult to apply, and we also acknowledge that stress on different characters may lead to different conclusions as to where any line between taxa should be drawn based on specimens. Occasional plants north of the middle of the Lower Peninsula with leaf blades somewhat pubescent beneath, but petioles essentially glabrous and leaves otherwise like A. saccharum are considered unusual A. saccharum, as are more common plants with glabrous foliage, but more rounded leaf lobes. A few, often late season, collections that appear to be A. nigrum, with leaves quite pubescent beneath, have the petioles essentially glabrous. Nevertheless, few specimens appear to be fully intermediate; these perhaps hybrids.

Locations

Allegan County
Barry County
Berrien County
Branch County
Calhoun County
Cass County
Eaton County
Genesee County
Gratiot County
Hillsdale County
Ingham County
Ionia County
Iosco County
Isabella County
Kalamazoo County
Kent County
Lapeer County
Lenawee County
Macomb County
Midland County
Newaygo County
Oakland County
Ottawa County
Sanilac County
Tuscola County
Van Buren County
Washtenaw County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 18, 2017. http://www.michiganflora.net/species.aspx?id=2650.