Page author: David Giblin
Alnus glutinosa
Black alder, European alder

Distribution: Occurring west of the Cascades crest in King County, where escaping from a wetland restoration planting. Great Lakes region east to the Atlantic Coast.

Habitat: Wetlands at low elevation.

Flowers: March-May

Origin: Introduced from Europe

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Wind


Multi-trunked trees to 20 meters tall.


Blades obovate to nearly orbiculate, 3--9 × 3--8 cm, margins often irregularly doubly serrate to nearly dentate, apex often retuse or obcordate, occasionally rounded; upper and lower surfaces heavily resin-coated.

Accepted Name:
Alnus glutinosa (L.) Gaertn.
Publication: Fruct. Sem. Pl. 2: 54. 1790.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Alnus glutinosa in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Alnus glutinosa checklist entry

OregonFlora: Alnus glutinosa information

E-Flora BC: Alnus glutinosa atlas page

CalPhotos: Alnus glutinosa photos

4 photographs:
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