Name:
Tsuga heterophylla - Thuja plicata Cool-Mesic Central Rocky Mountain Forest & Woodland Alliance
Reference:
NatureServe Biotics 2019
Description:
This alliance occurs in all the maritime-influenced regions of northeastern Washington, northern Idaho, British Columbia and northeastern Montana. Communities occupy positions that represent the cooler part of the environmental gradient that supports these forests. These forests have a closed tree canopy less than 50 m tall that is dominated or codominated by <i>Thuja plicata</i> and/or <i>Tsuga heterophylla</i>. <i>Abies grandis, Abies lasiocarpa, Larix occidentalis, Picea engelmannii, Pinus contorta, Pinus monticola, Pseudotsuga menziesii</i>, or <i>Taxus brevifolia</i> may be present. The understory is complex and diverse from low, sparse forb-dominated to shrub-dominated understories. Common broad-leaved evergreen and deciduous shrubs may include <i>Acer circinatum, Alnus viridis ssp. sinuata, Amelanchier alnifolia, Lonicera utahensis, Mahonia aquifolium, Menziesia ferruginea, Paxistima myrsinites, Rosa gymnocarpa, Spiraea betulifolia, Symphoricarpos albus, Vaccinium membranaceum</i>, and <i>Vaccinium parvifolium</i>. The most common dominant herbaceous species include <i>Aralia nudicaulis, Clintonia uniflora</i>, and <i>Xerophyllum tenax</i>. Other common herbaceous associates include <i>Arnica latifolia, Asarum caudatum, Bromus vulgaris, Clintonia uniflora, Coptis occidentalis, Galium triflorum, Goodyera oblongifolia, Gymnocarpium dryopteris, Maianthemum stellatum, Prosartes hookeri, Pyrola asarifolia, Tiarella trifoliata, Trillium ovatum</i>, and <i>Viola orbiculata</i>. These forests occur at 550 to 1675 m. Positions include toeslopes to the tops of ridges, bottomlands, benches and stream terraces.
Accession Code:
urn:lsid:vegbank.org:commConcept:38832-{62E340E6-120C-4573-84CA-7E6BC0827977}
Plot-observations of this Community Concept:
0
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