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

Alnus incana (L.) Moench
Speckled Alder (gray alder; mountain alder)
Betulaceae (Birch family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #6898)

E-Flora BC Static Map
Distribution of Alnus incana
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SUBTAXA PRESENT IN BC
Alnus incana ssp. tenuifolia

Species Information

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General:
Deciduous shrub or tree, up to 12 m tall, usually 2-5 m tall, new growth short-hairy; axillary buds with short stalks; bark scaly, often lichen-covered, yellowish-brown or grey.
Leaves:
Alternate, deciduous, smooth, coarsely to irregularly toothed, the teeth pointing outwards, leaf margins not rolled under, brownish in the fall.
Flowers:
Inflorescence of male and female catkins, which open before the leaves on previous year's growth; male catkins with stalks.
Fruits:
Small nutlets, without wings; female cones 1-1.5 cm long, egg-shaped.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

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

Habitat / Range

Moist forests, streamsides, bogs and fens in the montane zone; common in BC east of the Coast-Cascade Mountains; N to AK, YT and NT, E to SK, and S to NM, AZ and CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Alnus incana

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) 7 879 2060
Slope Gradient (%) 0 7 205
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 24 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 5 8
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
2151
Modal BEC Zone Class
SBS
All BEC Zones (# of stations/zone) species was recorded in: BG(20), BWBS(335), CWH(17), ESSF(111), ICH(446), IDF(215), MH(1), MS(207), PP(15), SBPS(35), SBS(675), SWB(1)

Synonyms and Alternate Names

Alnus tenuifolia Nutt.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References