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

Alnus viridis subsp. sinuata (Chaix) DC. (Regel) A. L÷ve & D. L÷ve
Sitka alder
Betulaceae (Birch family)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #25508)

E-Flora BC Static Map
Distribution of Alnus viridis subsp. sinuata
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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:
Two subspecies occur in BC:

1. Leaf margins shallowly lobed as well as finely saw-toothed..................... ssp. sinuata (Regel) A.& D. Love

1. Leaf margins not at all or only slightly lobed, mostly merely finely saw-toothed..................... ssp. crispa [Ait.] Turrill

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Blooming Period:
Summer
Fruit/Seed characteristics:
Colour: Brown
Present from Summer to Fall
Source:  The USDA

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 viridis ssp. sinuata

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) 0 1172 2500
Slope Gradient (%) 0 22 205
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 27 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 4 8
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
3292
Modal BEC Zone Class
ESSF
All BEC Zones (# of stations/zone) species was recorded in: AT(2), BG(4), BWBS(238), CMA(1), CWH(92), ESSF(802), ICH(648), IDF(186), MH(26), MS(580), PP(7), SBPS(16), SBS(575), SWB(2)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Alnus alnobetula (Ehrh.) K. Koch p.p.
Alnus crispa subsp. laciniata Hultén
Alnus crispa subsp. sinuata (Regel) Hultén
Alnus crispa var. sinuata
Alnus sinuata (Regel) Rydb.
Alnus viridis var. sinuata Regel
Duschekia sinuata (Regel) Pouzar

Taxonomic and Nomenclatural Links

Additional Photo Sources

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General References