The leaf is dark green; margins are doubly serrate/dentate, with pinnate venation. The leaf notch in the top of the leaf is a good identification feature although some leaves will have a rounded apex. There is very little, if any, fall color. The leaves fall off still green. Some yellowing of the leaves may occur during a long fall season.
Karren Wcisel, TreeTopics.com
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Alnus glutinosa, European alder, black alder, deciduous, tree