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

Betula occidentalis Hook.
water birch (black birch; mountain birch; red birch)
Betulaceae (Birch family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #3450)

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Distribution of Betula occidentalis
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Species Information

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General:
Deciduous small tree or large shrub, 3-10 m tall; bark dark reddish-brown to black.
Leaves:
Alternate, deciduous, rounded to sharp-pointed at the tip, usually doubly saw-toothed, thin and membranous, 1-7 cm long, leaf stalks more than 1 cm long.
Flowers:
Male and female flowers in separate catkins 2-4 cm long; flowers emerging before or with the leaves; catkins breaking up at maturity.
Fruits:
Nutlets with broad wings, at least twice as wide as the nutlets; bracts with pointed, lateral lobes.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Yellow
Blooming Period:
Mid Spring
Fruit/Seed characteristics:
Colour: Brown
Present over the Spring
Source:  The USDA

Habitat / Range

Wet to moist streambanks, forests and marshes in the steppe and montane zones; frequent in S BC east of the Coast-Cascade Mountains, rare northward; N to AK, YT and NT, E to NF, and S to CO, UT and CA.

Source: The Illustrated Flora of British Columbia

Additional Notes

Cut-leaf Water Birch

Water birch is a small, shrubby birch found [particularly] in the southern interior of British Columbia and is distinguished from paper birch by its smaller size and by the presence of wartlike glands on its twigs. The leaves are roughly heart shaped with small teeth along the margins. In the cut-leaf mutant, found near Revelstoke, the developmet of the leaf is limited to narrow regions along some of the main veins so that the leaves look like mere skelteons of normal leaves.

Source:

Extracted from Griffiths and Ganders, 1983. Wildflower Genetics: A Field Guide for British Columbia and the Pacific Northwest.

Ecology

Ecological Framework for Betula occidentalis

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) 75 846 1645
Slope Gradient (%) 0 12 150
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
10 102 344
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:
208
Modal BEC Zone Class
IDF
All BEC Zones (# of stations/zone) species was recorded in: BG(23), BWBS(9), CWH(1), ESSF(4), ICH(12), IDF(81), MS(18), PP(39), SBS(4), SWB(6)

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

Betula beeniana A. Nels.
Betula fontinalis Sarg.
Betula occidentalis var. inopina (Jepson) C.L. Hitchc.
Betula papyrifera subsp. occidentalis (Hook.) Hult╬śn
Betula papyrifera var. occidentalis (Hook.) Sarg.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

Species References

Griffiths, Anthony J. F. and Fred R. Ganders. 1983. Wildflower Genetics: A Field Guide for British Columbia and the Pacific Northwest. Flight Press, Vancouver.

General References