Also called gray alder and Alnus rugosa.  Part of alder  genus Alnus and birch / alder / hazel / hornbeam  family Betulaceae.

Native to the northern hemisphere:  🇪🇺 Europe, Asia, 🇨🇦 Canada and 🇺🇸 USA.  Different subspecies specialize in different areas.  For example, native to western 🇨🇦 Canada and 🇺🇸 USA is Alnus incana subsp. tenuifolia, also called 🗻︎ mountain alder and thinleaf alder.

Uses by native peoples
(Ethnobotany database)
  Alnus hosts caterpillars of 267 species
of butterflies and moths, in some areas.

Learn more about speckled alder Alnus incana

Discover Life Encyclopedia of Life Google Google images Michigan Flora USDA PLANTS db USFS Wikipedia