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Thuja plicata - Tsuga heterophylla Rocky Mountain Swamp Forest Alliance | NatureServe Biotics 2019
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Name: Thuja plicata - Tsuga heterophylla Rocky Mountain Swamp Forest Alliance Reference: NatureServe Biotics 2019 Description: These seasonally flooded forests are characterized by a dense to somewhat open coniferous canopy dominated by <i>Thuja plicata</i>. <i>Tsuga heterophylla</i> is a typical associate in these stands. <i>Pseudotsuga menziesii, Abies grandis</i>, and <i>Abies lasiocarpa</i> may also share the upper tree canopy. The herbaceous layer is diverse and dominated by wetland and moist forest species, including <i>Lysichiton americanus, Athyrium filix-femina, Achlys triphylla</i>, and <i>Senecio triangularis</i>. Mosses and lichens are common on trees, downed logs, and the forest floor. The alliance occurs in the marine-influenced coastal and interior mountains of northeastern Washington, northern Idaho, southeastern British Columbia and northwestern Montana east of the Continental Divide. This alliance is found from sea level in coastal areas to over 1800 m in the northern Rocky Mountains of Idaho and western Montana. Annual precipitation ranges from less than 100 cm in the Northern Rockies to 300 cm or more in the coastal ranges of Oregon and Washington. These forests occur on riparian, toeslope, or valley bottom sites that are flooded for a substantial portion of the growing season. The seasonal flooding originates mostly from precipitation and snowmelt collecting in basins, with a small amount of streamside flooding. The soils are organic and saturated for part of the growing season. These forests are often transitional to non-forested wetlands.  Accession Code: urn:lsid:vegbank.org:commConcept:38990-{A17C92AA-6BE6-434C-83EA-C84DF29961E7} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 26-Sep-2014 to: ongoing
	status: accepted Community's Parent: Thuja plicata - Picea engelmannii / Lysichiton americanus Swamp Forest Group This Community's Level: Alliance This Community's Children: Show/Hide   Thuja plicata / Carex disperma Swamp Forest   Thuja plicata - Tsuga heterophylla / Oplopanax horridus Rocky Mountain Swamp Forest		Names:   UID: ELEMENT_GLOBAL.2.899828 NatureServe Explorer   Code: A3776   Translated: Western Red-cedar - Western Hemlock Rocky Mountain Swamp Forest Alliance   Common: Rocky Mountain Western Red-cedar - Western Hemlock Swamp Forest   Scientific: Thuja plicata - Tsuga heterophylla Rocky Mountain Swamp Forest Alliance