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Abies amabilis - Tsuga heterophylla / Oplopanax horridus Swamp Forest | NatureServe Biotics 2019
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Name: Abies amabilis - Tsuga heterophylla / Oplopanax horridus Swamp Forest Reference: NatureServe Biotics 2019 Description: This Pacific silver fir forest of the Pacific Northwest has a canopy that is usually codominated by <i>Abies amabilis</i> and <i>Tsuga heterophylla</i>, with <i>Thuja plicata</i> often codominant as well. <i>Abies amabilis</i> usually dominates tree regeneration and always has at least 10% total cover. <i>Pseudotsuga menziesii</i> is occasionally prominent to codominant. The shrub layer always has at least 5% cover of <i>Oplopanax horridus</i>, which typically dominates or codominates the undergrowth. A variety of other shrubs may be prominent to codominant, especially <i>Vaccinium alaskaense</i> and <i>Rubus spectabilis</i>. A rich herb layer is rather variable in composition but almost always has considerable <i>Tiarella trifoliata var. unifoliata, Gymnocarpium dryopteris</i>, and/or <i>Athyrium filix-femina</i>. Other frequent herbs are <i>Viola glabella, Clintonia uniflora, Trillium ovatum</i>, and <i>Streptopus lanceolatus var. curvipes</i>. In the Cascade Range and the Olympic Mountains, this association occurs at middle elevations on sites with shallowly subirrigated soils that are poorly drained, usually due to an underlying impermeable layer. Sites are often associated with springs, seeps or small streams. Many natural-origin stands occur on protected lands with few threats from logging and development.  Accession Code: urn:lsid:vegbank.org:commConcept:28913-{F19074EC-7F5E-4B4B-8077-41D62F4E331D} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 10-May-2016 to: ongoing
	status: accepted Community's Parent: Tsuga mertensiana - Abies amabilis Swamp Woodland Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.688873 NatureServe Explorer   Code: CEGL000004   Translated: Pacific Silver Fir - Western Hemlock / Devil's-club Swamp Forest   Scientific: Abies amabilis - Tsuga heterophylla / Oplopanax horridus Swamp Forest (convergence) and Synonyms: (similar) CEGL000004 (similar) Abies amabilis / Oplopanax horridus Forest (similar) Abies amabilis / Oplopanax horridus Forest