Similar species: European Black Alder (Alnus glutinosa) - leaves are indented at the tips, roundish. Speckled Alder (Alnus incana) - leaves are double-toothed. Alder-leaved Buckthorn (Rhamnus alnifolia) - not an Alder.
PLEASE NOTE: A coloured Province or State means this species occurs somewhere in that Province/State.
The entire Province/State is coloured, regardless of where in that Province/State it occurs.
(Range map provided courtesy of the USDA website
and is displayed here in accordance with their
Policies)