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Populus tremuloides / Carex obnupta Riparian Forest
Translated Name: Quaking Aspen / Slough Sedge Riparian Forest
Unique Identifier: CEGL003371
Classification Approach: International Vegetation Classification (IVC)
Summary: The single known occurrence of this association in Oregon is in a seasonally flooded depression on shallow-soiled basalt scabland. It may be a relict of a type that was more widespread historically. Seasonal flooding is from precipitation, but summer drying precludes formation of peat. The tree layer is dominated by Populus tremuloides with up to 50% cover. The shrub layer includes Spiraea douglasii and Salix hookeriana with covers of 80 and 10%, respectively. The sparse herb layer is dominated by only Carex obnupta with very low cover. The moss layer has up to 98% cover by Sphagnum mendocinum. Large expanses of swamp vegetation once occurred in the northern Willamette and Tualatin valleys, and this association may have been part of it. Populus tremuloides still occurs in a number of low-elevation sites in Clackamas, Multnomah and Washington counties, Oregon, but most are on uplands that do not support wetland vegetation; it becomes very rare at low elevations south of Clackamas County. These wetlands are thought to be more frequent in western Washington and perhaps extend to southwestern British Columbia but have not been sampled adequately. Spiraea douglasii and other species of Sphagnum have been observed in some stands in Washington. Despite the abundance of Spiraea douglasii in this association, Carex obnupta is used here to distinguish these low-elevation occurrences west of the Cascade Range from some Populus tremuloides / Spiraea douglasii stands reported from east of the Cascades.



Classification

Classification Confidence: Low

Vegetation Hierarchy
Class 1 - Forest & Woodland
Subclass 1.B - Temperate & Boreal Forest & Woodland
Formation 1.B.3 - Temperate Flooded & Swamp Forest
Division 1.B.3.Nc - Rocky Mountain-Great Basin Montane Flooded & Swamp Forest
Macrogroup Rocky Mountain-Great Basin Montane Riparian & Swamp Forest
Group Rocky Mountain-Great Basin Montane Riparian & Swamp Forest
Alliance Quaking Aspen Riparian Forest

This is the revised vegetation hierarchy. For more information see Classification Sources and usnvc.org.



Related Concepts from Other Classifications

Related Subnational Community Units
These data are subject to substantial ongoing revision and may be out of date for some states.
In the U.S., contact the state Heritage Program for the most complete and up-to-date information at: http://www.natureserve.org/natureserve-network.
Information from programs in other jurisdictions will be posted when they are made available.
Subnation Concept Name Relationship to Standard Confidence Reference
Oregon Populus tremuloides / Carex obnupta Equivalent Certain Kagan et al. 2004
Washington Populus tremuloides / Carex obnupta Swamp Forest Equivalent Certain WNHP unpubl. data 2018


Other Related Concepts
Related Concept Name: Populus tremuloides / Carex obnupta
Relationship: = - Equivalent
Reference: McCain, C., and J. A. Christy. 2005. Field guide to riparian plant communities in northwestern Oregon. Technical Paper R6-NR-ECOL-TP-01-05. USDA Forest Service, Pacific Northwest Region, Portland. 357 pp.
Related Concept Name: Populus tremuloides / Carex obnupta Association
Relationship: = - Equivalent
Reference: Christy, J. A. 2004. Native freshwater wetland plant associations of northwestern Oregon. Oregon Natural Heritage Information Center, Oregon State University, Portland, OR.
Related Concept Name: Populus tremuloides / Carex obnupta Forest Association
Relationship: = - Equivalent
Reference: Rocchio, F. J., R. C. Crawford, and C. C. Thompson. 2012. San Juan Island National Historical Park vegetation classification and mapping project. Natural Resource Report NPS/NCCN/NRR--2012/603. National Park Service, Fort Collins, CO. 188 pp.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES204.090 North Pacific Hardwood-Conifer Swamp
CES306.833 Rocky Mountain Subalpine-Montane Riparian Woodland


NatureServe Conservation Status
Global Status: G2 (01Oct2002)
Rounded Global Status: G2 - Imperiled

Distribution
Color legend for Distribution Map
United States Distribution: OR, WA
Canadian Province Distribution: BC
Global Distribution: Canada, United States
Global Range: This association is found in the Willamette Valley, Puget Trough, and possibly the lower Fraser River valley and southeastern Vancouver Island (Christy 2004).

U.S. Forest Service Ecoregions
Domain Name: Humid Temperate Domain
Division Name: Marine Division
Province Name: Pacific Lowland Mixed Forest Province
Province Code: 242 Occurrence Status: Confident or certain
Section Name: Willamette Valley and Puget Trough Section
Section Code: 242A Occurrence Status: Confident or certain


Vegetation


Environmental Setting

Wetland Indicator: Y


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): J.A. Christy (2004)
Element Description Edition Date: 10Jun2006
Element Description Author(s): J.A. Christy (2004)

Ecological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).


References
  • Christy, J. A. 2001a. Low-elevation Sphagnum wetlands in western Oregon. Report to Environmental Protection Agency, Region 10. Oregon Natural Heritage Program, Portland. 90 pp.

  • Christy, J. A. 2004. Native freshwater wetland plant associations of northwestern Oregon. Oregon Natural Heritage Information Center, Oregon State University, Portland, OR.

  • Kagan, J. S., J. A. Christy, M. P. Murray, and J. A. Titus. 2004. Classification of native vegetation of Oregon. January 2004. Oregon Natural Heritage Information Center, Portland. 52 pp.

  • McCain, C., and J. A. Christy. 2005. Field guide to riparian plant communities in northwestern Oregon. Technical Paper R6-NR-ECOL-TP-01-05. USDA Forest Service, Pacific Northwest Region, Portland. 357 pp.

  • Rocchio, F. J., R. C. Crawford, and C. C. Thompson. 2012. San Juan Island National Historical Park vegetation classification and mapping project. Natural Resource Report NPS/NCCN/NRR--2012/603. National Park Service, Fort Collins, CO. 188 pp.

  • WNHP [Washington Natural Heritage Program]. 2018. Unpublished data files. Washington Natural Heritage Program, Department of Natural Resources, Olympia, WA.

  • Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.


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