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

Rhododendron tomentosum subsp. subarcticum Harmaja (Harmaja) G. Wallace
northern Labrador tea (marsh Labrador tea)
Ericaceae (Crowberry family)

Introduction to Vascular Plants
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Distribution of Rhododendron tomentosum subsp. decumbens
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Introduction

In 2015, the BC Conservation Data Centre changed the name of this taxon from Rhododendron tomentosum ssp. subarcticum to Rhododendron tomentosum ssp. decumbens.

Species Information

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General:
Decumbent to erect shrubs; stems mostly 10-50 cm long/tall, rusty soft-hairy.
Leaves:
Alternate, evergreen, leathery, linear to narrowly oblong, 0.3-2.5 cm long, 1-3 (7) mm wide, tapering somewhat towards tip, margins strongly rolled under, rusty soft-hairy beneath; stalks 0.5-2 mm long.
Flowers:
In terminal umbrella-like clusters; flower stalks 0.8-2 cm long, with contorted reddish hairs, glandular, usually abruptly bent near the apex in fruit; corollas much as in L. groenlandicum; stamens usually 10, filaments hairy below the middle; calyces less than 1 mm long, fringed with long, reddish hairs, glandular.
Fruits:
Capsules, egg-shaped, 3-5 mm long, glandular.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Bogs and moist to wet peaty meadows, heath and tundra in the montane to alpine zones; locally frequent in extreme northern BC; circumpolar, N to AK, YT and NT, and E to Labr.; Eurasia.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Rhododendron tomentosum ssp. decumbens

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) 150 1220 1741
Slope Gradient (%) 0 19 95
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W] 		10 332 337
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric] 		1 4 8
Modal Nutrient Regime
Class		 C
Number of field plots
 species was recorded in:		 25
Modal BEC Zone Class
 BAFA
All BEC Zones (# of stations/zone) species was recorded in: BAFA(10), BWBS(4), CWH(1), MH(1), MS(1), SBS(1), SWB(7)

Taxonomic and Nomenclatural Links

Flora North America treatment for Ericaceae
Genetic information (NCBI Taxonomy Database)
 International Plant Names Index
 Taxonomic Information from the World Flora Online
 Integrated Taxonomic Information System

Additional Photo Sources

Images From CalPhoto
UT Austin's Native Plant Database
 Google Image Search
 Flickr Image Search

General References

Google Scholar Search
Family References
 General Botanical References for BC
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2024-07-27 5:16:49 PM ]
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