Abstract for CNVC00007


Tsuga heterophylla - Thuja plicata (Pseudotsuga menziesii - Abies amabilis) / Gymnocarpium dryopteris - Clintonia uniflora

Western Hemlock - Western Red Cedar (Douglas-fir - Pacific Silver Fir) / Common Oak Fern - Singleflower Clintonia
Pruche de l'Ouest - Thuya géant (Douglas de Menzies - Sapin gracieux) / Gymnocarpe du chêne - Clintonie uniflore

This mature to old-growth, coniferous forest association is endemic to the coast / interior climatic transition of the middle to leeward eastern valley systems of the Coast Mountains and the Fraser River valley of British Columbia. It occurs on various topographic positions with mainly steep slope gradients. Mesic, nutrient-rich soils are normal for CNVC00007; soil drainage is variable, ranging from rapid to moderately well. Western hemlock (Tsuga heterophylla) and western red cedar (Thuja plicata) co-dominate the canopy, often with Douglas-fir (Pseudotsuga menziesii) and Pacific silver fir (Abies amabilis). The shrub layer is relatively sparse, comprising mostly regenerating canopy trees with various blueberries: red huckleberry (Vaccinium parvifolium), Alaskan blueberry (V. alaskaense), and oval-leaved blueberry (V. ovalifolium). The diverse herb layer is dominated by three-leaved foamflower (Tiarella trifoliata), common oak fern (Gymnocarpium dryopteris) and singleflower clintonia (Clintonia uniflora). Lanky moss (Rhytidiadelphus loreus) and stairstep moss (Hylocomium splendens) are the main moss-layer species.