Red alder is probably the most common deciduous tree in the southern part of British Columbia. The leaves normally have shallow, rounded teeth along their margins. The leaves of the cut-leaf mutant form have irregular, sharply pointed teeth and lobes, thus resembling some black oak leaves more than alder leaves.
Source: Extracted with permission from Griffiths and Ganders, 1983.
This species flowers in the first week in March in the Fraser Delta.
Ecological Framework for Alnus rubra
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)
A shade-intolerant, sub montane to montane, Pacific North American deciduous broadleaved tree. An abundant species that grows in cool mesothermal climates on nitrogen-rich soils (Moder and Mull humus forms); its occurrence decreases with increasing elevation and continentality. Forms dense stands in the initial stages of primary succession on floodplains or secondary succession on watershedding sites. Persists along streams and on water-collecting sites, usually associated with Lysichitum americanum; tolerates fluctuating groundwater tables. This fast -growing tree regenerates abundantly from seed on exposed mineral soil and from stump sprouts following cutting. May hinder regeneration and growth of conifers. Symbiosis with nitrogenfixing Actinomycetes enhances the supply of available soil nitrogen. Suitable as a temporary nurse species for shade-tolerant conifers, especially on nitrogen-deficient sites; however, it may decrease both soil pH and base content of some soils. Characteristic of youngseral mesothermal forests.
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:
2021-01-19 6:59:52 PM
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