Alnus glutinosa (L.) Gaertn.
Common Name: BLACK ALDER
Coefficient of Conservatism: *
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Ad Tree

Alnus glutinosa ex W. H. Wagner slide collection

A Eurasian species, escaped along banks of rivers and lakes especially in the southeastern Lower Peninsula, where first collected in 1913 in Wayne Co. Locally forming dense stands and becoming invasive. Planted as far north as Baraga Co., so potentially able to spread throughout the State.

Resembles A. incana in early flowering and nuts wingless or nearly so, but the young parts are very glutinous; the leaves are quite distinctive with their blunt apex. This is a much larger species than our two native Alnus, typically a true tree with a single trunk. 

Locations

Allegan County
Berrien County
Kalamazoo County
Mason County
Ottawa 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 16, 2017. http://www.michiganflora.net/species.aspx?id=547.