Photo: Alnus glutinosa 9.

f. pyramidalis. Catkins, not yet fully open. Helsinki bot.g. (Kaisan.), Finland. Planted. 2006-04-22.
Alnus glutinosa (L.) Gaertn. Engl.: common alder, black alder, European alder. Deu.: Schwarz-Erle. Suom.: tervaleppä. Sven.: klibbal, al, grönal. Bot. syn.: Alnus alnus (L.) Britt., Alnus rotundifolia Mill., Alnus vulgaris Hill., Betula alnus L. var. glutinosa L.
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Photo: Alnus glutinosa 9.