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Native to the northern hemisphere: 🇪🇺 Europe, Asia, and western 🇨🇦 Canada and 🇺🇸 USA.
Part of alder genus Alnus in alder / birch / hazel / hornbeam family Betulaceae in bayberry / beech / birch / oak / walnut order Fagales.
Different subspecies specialize in different areas, including:
Uses by native peoples(Ethnobotany database)
Alnus hosts caterpillars of 267 speciesof butterflies and moths, in some areas.
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🌳︎ broadleaves, ╟ alternate, 🍂︎ simple non-lobed ▲▴▲▴ doubly-toothed