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

Rhododendron albiflorum Hook.
white-flowered rhododendron (Cascade azalea; white rhododendron)
Ericaceae (Crowberry family)

Introduction to Vascular Plants

© Brian Klinkenberg  Email the photographer   (Photo ID #14413)

E-Flora BC Static Map
Distribution of Rhododendron albiflorum
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Species Information

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General:
Erect, slender-branched shrub, stems 0.5-1.2 (2) m tall; young twigs covered with coarse reddish hairs; bark peeling.
Leaves:
Alternate, deciduous, thin, in clusters along branches, especially at tips, narrowly elliptic to ob lanceolate, 4-8 cm long, pointed at ends, entire to wavy-margined, yellowish-green, upper surfaces with fine rusty hairs; stalks 5-10 mm long, glandular-hairy as well as coarsely reddish-hairy.
Flowers:
In axillary clusters of 1 to 4 on previous year's growth; flower stalks slender, up to 1.5 cm long, glandular-hairy; corollas white, broadly bell-shaped, 1.5-2 cm wide, up to 2 cm long, fused near base, the lobes spreading, nearly equal, entire; calyx divided to the base, the 5 lobes 8-10 mm long, leaflike, hairy with fine, gland-tipped, and some long, reddish hairs; stamens 10, filaments densely hairy on the lower half; anthers egg-shaped, unawned.
Fruits:
Capsules, egg-shaped, 6-8 mm long, thick-walled.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
White
Blooming Period:
Late Summer
Fruit/Seed characteristics:
Colour: Black
Present from Summer to Fall
Source:  The USDA

Habitat / Range

Dry to wet forests and openings in the montane and subalpine zones; common in C and S BC; E to SW AB, and S to OR and W MT.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Rhododendron albiflorum

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) 6 1571 2515
Slope Gradient (%) 0 28 420
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 352 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 3 8
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
6048
Modal BEC Zone Class
ESSF
All BEC Zones (# of stations/zone) species was recorded in: AT(4), BAFA(3), BWBS(33), CWH(32), ESSF(4614), ICH(336), IDF(6), MH(113), MS(257), SBPS(5), SBS(144), SWB(2)

Ecological Indicator Information

A shade-tolerant/intolerant, montane to alpine, Western North American deciduous shrub distributed more in the Cordilleran than the Pacific region. Occurs predominantly in continental subalpine boreal climates on moderately dry to fresh, nitrogen-poor soils (Mor humus forms); its occurrence increases with increasing continentality and decreases with increasing latitude. Common and often dominant on water-shedding sites in open­canopy coniferous forests in the coast-interior ecotone; often on decaying coniferous wood. Typically associated with Barbilophozia floerkei, B. lycopodioides, Rhytidiopsis robusta, and Vaccinium membranaceum. An oxylophytic species characteristic of subalpine continental forests.

SourceIndicator Plants of Coastal British Columbia (Information applies to coastal locations only)

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 alpine tundra & boreal.

Taxonomic and Nomenclatural Links

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General References