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Alnus rubra / Physocarpus capitatus - Philadelphus lewisii Swamp Forest
Translated Name: Red Alder / Pacific Ninebark - Lewis' Mock Orange Swamp Forest
Unique Identifier: CEGL000002
Classification Approach: International Vegetation Classification (IVC)
Summary: Found only along a few streams on the northwest slope of the Blue Mountains of Oregon and Washington, this riparian forest community usually has Alnus rubra as the sole tree species in a closed canopy. This community types typically lines "V-shaped" valleys with moderate gradient (2-7%) along 5- to 50-foot wide streams between the elevations of 610 to 1070 m (2000-3500 feet). Individual Abies grandis or Pseudotsuga menziesii trees may be seen on long stabilized terraces. The community is floristically characterized as having a tall deciduous layer dominated or containing Physocarpus capitatus and/or Philadelphus lewisii although Cornus sericea or Symphoricarpos albus can be dominant. Characteristic herbaceous species are Maianthemum stellatum, Heracleum maximum, Mitella pentandra, Osmorhiza berteroi, and Angelica arguta, although Petasites frigidus var. palmatus, Tiarella trifoliata var. unifoliata, Carex deweyana, or Cinna latifolia can be dominant.



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.Ng - Vancouverian Flooded & Swamp Forest
Macrogroup Vancouverian Flooded & Swamp Forest
Group North Pacific Montane Riparian Woodland
Alliance Quaking Aspen - Red Alder Swamp 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These data are subject to substantial ongoing revision and may be out of date for some states.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
Idaho Alnus rubra / Physocarpus capitatus - Philadephus lewisii Forest Equivalent Certain IDCDC unpubl. data
Oregon Alnus rubra / Physocarpus capitatus Equivalent Certain Kagan et al. 2004


Other Related Concepts
Related Concept Name: Alnus rubra / Cornus stolonifera
Relationship: F - Finer
Reference: Crowe, E. A., and R. R. Clausnitzer. 1997. Mid-montane wetland plant associations of the Malheur, Umatilla, and Wallowa-Whitman national forests. Technical Paper R6-NR-ECOL-TP-22-97. USDA Forest Service, Pacific Northwest Region, Portland, OR.
Related Concept Name: Alnus rubra / Petasites frigidus palmatus
Relationship: I - Intersecting
Reference: Crowe, E. A., and R. R. Clausnitzer. 1997. Mid-montane wetland plant associations of the Malheur, Umatilla, and Wallowa-Whitman national forests. Technical Paper R6-NR-ECOL-TP-22-97. USDA Forest Service, Pacific Northwest Region, Portland, OR.
Related Concept Name: Alnus rubra / Physocarpus capitatus
Relationship: = - Equivalent
Reference: Crowe, E. A., and R. R. Clausnitzer. 1997. Mid-montane wetland plant associations of the Malheur, Umatilla, and Wallowa-Whitman national forests. Technical Paper R6-NR-ECOL-TP-22-97. USDA Forest Service, Pacific Northwest Region, Portland, OR.
Related Concept Name: Alnus rubra / Physocarpus capitatus Association
Relationship: = - Equivalent
Reference: Crowe, E. A., B. L. Kovalchik, and M. J. Kerr. 2004. Riparian and wetland vegetation of central and eastern Oregon. Oregon Natural Heritage Information Center, Institute for Natural Resources, Oregon State University, Portland. 473 pp. [http://oregonstate.edu/ornhic/ publications.html]
Related Concept Name: Alnus rubra / Symphoricarpos albus
Relationship: F - Finer
Reference: Crowe, E. A., and R. R. Clausnitzer. 1997. Mid-montane wetland plant associations of the Malheur, Umatilla, and Wallowa-Whitman national forests. Technical Paper R6-NR-ECOL-TP-22-97. USDA Forest Service, Pacific Northwest Region, Portland, OR.
Related Concept Name: Alnus rubra / Alluvial Bar
Relationship: F - Finer
Reference: Crowe, E. A., and R. R. Clausnitzer. 1997. Mid-montane wetland plant associations of the Malheur, Umatilla, and Wallowa-Whitman national forests. Technical Paper R6-NR-ECOL-TP-22-97. USDA Forest Service, Pacific Northwest Region, Portland, OR.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES304.768 Columbia Basin Foothill Riparian Woodland and Shrubland


NatureServe Conservation Status
Global Status: G1 (16Oct2002)
Rounded Global Status: G1 - Critically Imperiled
Reasons: This riparian community is found in only three drainages in one Washington county and one Oregon county. It occurs in a narrow climatic zone (100-150 square miles) that supports Cascadian species in the Rocky Mountains. Road development in and along floodplains and upstream effects reduce condition and viability. Sites occur in wilderness, others on USFS lands. The largest occurrence is in a proposed RNA that is a city watershed. Completion of a proposed dam on Mill Creek would threaten the largest occurrences of the type.

Distribution
Color legend for Distribution Map
United States Distribution: IDpotentially occurs, OR, WA
Global Distribution: United States
Global Range: This association is located on the northwestern slope of the Blue Mountains of Oregon and Washington.

U.S. Forest Service Ecoregions
Domain Name: Dry Domain
Division Name: Temperate Steppe Regime Mountains
Province Name: Middle Rocky Mountain Steppe - Coniferous Forest - Alpine Meadow Province
Province Code: M332 Occurrence Status: Confident or certain
Section Name: Idaho Batholith Section
Section Code: M332A Occurrence Status: Confident or certain
Section Name: Blue Mountains Section
Section Code: M332G Occurrence Status: Confident or certain


Vegetation


Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Alnus rubra G1 Broad-leaved deciduous tree Tree canopy  
 
 
Philadelphus lewisii G1 Broad-leaved deciduous shrub Tall shrub/sapling  
 
 
Physocarpus capitatus G1 Broad-leaved deciduous shrub Tall shrub/sapling  
 
 


Environmental Setting

Wetland Indicator: Y


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): R.C. Crawford
Element Description Edition Date: 16Oct2002
Element Description Author(s): R.C. Crawford
NatureServe Conservation Status Factors Edition Date: 16Oct2002
NatureServe Conservation Status Factors Author(s): R.C. Crawford

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


References
  • Bailey, R. G., P. E. Avers, T. King, and W. H. McNab, editors. 1994. Ecoregions and subregions of the United States (map). U.S. Geological Survey, Washington, DC. Scale 1:7,500,000 colored. Accompanied by a supplementary table of map unit descriptions compiled and edited by W. H. McNab and R. G. Bailey. Prepared for the USDA Forest Service.

  • Crowe, E. A., B. L. Kovalchik, and M. J. Kerr. 2004. Riparian and wetland vegetation of central and eastern Oregon. Oregon Natural Heritage Information Center, Institute for Natural Resources, Oregon State University, Portland. 473 pp. [http://oregonstate.edu/ornhic/ publications.html]

  • Crowe, E. A., and R. R. Clausnitzer. 1997. Mid-montane wetland plant associations of the Malheur, Umatilla, and Wallowa-Whitman national forests. Technical Paper R6-NR-ECOL-TP-22-97. USDA Forest Service, Pacific Northwest Region, 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.

  • Omernik, J. M. 1995. Ecoregions: A framework for environmental management. Pages 49-62 in: W. S. Davis and T. P. Simon, editors. Biological assessment and criteria: Tools for water resource planning and decision making. Lewis Publishers, Boca Raton, FL.

  • 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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Data last updated: March 2019