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

Alnus alnobetula subsp. crispa
green alder
Betulaceae (Birch family)

Introduction to Vascular Plants

© Ian Cruickshank  Email the photographer   (Photo ID #60674)

E-Flora BC Static Map
Distribution of Alnus alnobetula ssp. crispa
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Species Information

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

Ecology

Ecological Framework for Alnus alnobetula ssp. crispa

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Minimum

Average

Maximum

Elevation (metres) 10 924 2094
Slope Gradient (%) 0 14 83
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 338 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 4 7
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
355
Modal BEC Zone Class
SBS
All BEC Zones (# of stations/zone) species was recorded in: BWBS(55), CWH(24), ESSF(58), ICH(47), IDF(4), MS(17), SBPS(3), SBS(124), SWB(3)

Synonyms and Alternate Names

Alnus crispa (Aiton) Pursh
Alnus crispa subsp. crispa
Alnus crispa var. elongata Raup
Alnus crispa var. mollis (Fern.) Fern.
Alnus viridis subsp. fruticosa (Rupr.) Nyman
Alnus viridis var. crispa (Aiton) House
Duschekia viridis (Chaix) Opiz p.p.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References