E-Flora BC: Electronic Atlas of the Flora of British Columbia

Alnus alnobetula (Ehrh.) K.Koch
green alder
Betulaceae (Birch family)

Introduction to Vascular Plants

© Jim Dickson  Email the photographer   (Photo ID #3510)

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Distribution of Alnus alnobetula
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Species Information

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Deciduous shrub or tree, 1-5 m tall; pointed axillary buds without stalks; bark scaly, sometimes lichen-covered, yellowish-brown or grey.
Alternate, deciduous, smooth, finely toothed 1-2 times, oval with pointed tips, 4-10 cm long, brownish in the fall.
Inflorescence of male and female catkins which open at the same time as the leaves on current year's growth; male catkins unstalked.
Small nutlets, with broad wings; female cones 1.5-2 cm long, egg-shaped.
Three subspecies occur in BC.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist slopes, streambanks, avalanche tracks, bogs and fens in all zones; ssp. crispa frequent in N BC, ssp. sinuata common throughout S BC, becoming less frequent and transitional to ssp. crispa in N BC; circumboreal, E to PQ and S to NC, MN, CO and CA.

Source: The Illustrated Flora of British Columbia

Synonyms and Alternate Names

Alnus viridis (Chaix) Spach

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References