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Populus balsamifera ssp. trichocarpa - Picea sitchensis - (Acer macrophyllum) / Oxalis oregana Forest | Western Ecology Working Group of...
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Name: Populus balsamifera ssp. trichocarpa - Picea sitchensis - (Acer macrophyllum) / Oxalis oregana Forest Reference: Western Ecology Working Group of... Description: This association is apparently limited to the western Olympic Peninsula, Washington, where it occurs in valley bottoms of major rivers. It is possible that it occurs farther south in coastal Washington or Oregon, though it would be rare there. It is found on fluvial terrace landforms, typically where riverine flooding appears to be currently infrequent (middle to upper terraces). Existing stands most often have a mixed broad-leaved deciduous-needle-leaved evergreen canopy, though some stands are dominated by the deciduous component with few evergreens. The canopy is a variable mixture of Populus balsamifera ssp. trichocarpa (always present in tallest layer), Picea sitchensis (always present), Acer macrophyllum, and in smaller amounts Alnus rubra. Understory trees are mostly Picea sitchensis. The understory is characterized by the constant presence and typical abundance of the forb Oxalis oregana. The deciduous broad-leaved shrub layer varies from sparse to well-developed and is typified by Rubus spectabilis and Acer circinatum. Other herbs that have high constancy and are often codominant are Tolmiea menziesii, Polystichum munitum, and Circaea alpina. Stachys chamissonis var. cooleyae, Mitella ovalis, Athyrium filix-femina, Carex deweyana, Poa trivialis, and Ranunculus repens (latter two non-native) are typically present. The association should be distinguishable by the prominence of Populus balsamifera ssp. trichocarpa in the upper canopy, and >10% cover of Picea sitchensis and >5% cover of Oxalis oregana.  Accession Code: VB.CC.24352.POPULUSBALSAMIF Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 17-Oct-2002 to: 17-Nov-2014
	status: accepted Community's Parent: Picea sitchensis - Populus balsamifera ssp. trichocarpa Temporarily Flooded Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   Translated: Black Cottonwood - Sitka Spruce - (Bigleaf Maple) / Redwood Sorrel Forest   UID: ELEMENT_GLOBAL.2.687707 NatureServe Explorer   Code: CEGL003418   Scientific: Populus balsamifera ssp. trichocarpa - Picea sitchensis - (Acer macrophyllum) / Oxalis oregana Forest (convergence) and Synonyms: (undetermined) Populus balsamifera ssp. trichocarpa - Picea sitchensis - (Acer macrophyllum) / Oxalis oregana Forest