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Salix sitchensis / Equisetum arvense - Petasites frigidus Wet Shrubland
Translated Name: Sitka Willow / Field Horsetail - Arctic Sweet-colt's-foot Wet Shrubland
Unique Identifier: CEGL003296
Classification Approach: International Vegetation Classification (IVC)
Summary: This riparian association occurs in western Washington at low to montane elevations on floodplains or low terraces. These sites are probably frequently flooded by overbank riverine flooding, and have coarse-textured soils (gravelly and/or sandy). It is most often found along larger streams or rivers with well-developed floodplains. The well-developed, tall-shrub layer is dominated by Salix sitchensis. Young Alnus rubra can be present to codominant or Populus balsamifera ssp. trichocarpa is often present. Small amounts of Rubus spectabilis are usually present. The herbaceous layer varies from rather sparse to moderately dense. Equisetum arvense and/or Petasites frigidus are usually present. A variety of other herbs may be present.



Classification

Classification Confidence: Low - Poorly Documented
Classification Comments: This type is common along the Elwha River in Olympic National Park, often with Alnus rubra as a codominant in the tall-shrub layer. A Mount Rainier plot is at a higher elevation than the previous concept and has numerous subalpine species prominent (Valeriana sitchensis, Arnica latifolia).

Vegetation Hierarchy
Class 2 - Shrub & Herb Vegetation
Subclass 2.C - Shrub & Herb Wetland
Formation 2.C.4 - Temperate to Polar Freshwater Marsh, Wet Meadow & Shrubland
Division 2.C.4.Nb - Western North American Temperate & Boreal Freshwater Marsh, Wet Meadow & Shrubland
Macrogroup Vancouverian Lowland Marsh, Wet Meadow & Shrubland
Group Vancouverian Wet Shrubland
Alliance Pacific Willow - Rose Spirea Wet Shrubland

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



Related Concepts from Other Classifications

Other Related Concepts
Related Concept Name: Alnus rubra/Salix sitchensis/Equisetum arvense Community Type
Relationship: ? - Undetermined
Reference: Mycek, L. 1994. A classification of riparian plant communities in three geomorphological provinces of the Cascade Mountains in western Washington State. M.S. thesis, University of Washington, Seattle. 122 pp.
Related Concept Name: Salix sitchensis / Petasites frigidus Association
Relationship: = - Equivalent
Reference: Diaz, N. M., and T. K. Mellen. 1996. Riparian ecological types, Gifford Pinchot and Mt. Hood national forests, and Columbia River Gorge National Scenic Area. Technical Report R6-NR-TP-10-96. USDA Forest Service, Pacific Northwest Region, Portland, OR. 203 pp. plus appendices.
Related Concept Name: Salix sitchensis-Rubus spectabilis Community Type
Relationship: ? - Undetermined
Reference: Mycek, L. 1994. A classification of riparian plant communities in three geomorphological provinces of the Cascade Mountains in western Washington State. M.S. thesis, University of Washington, Seattle. 122 pp.
Related Concept Name: Salix sitchensis/(Equisetum arvense) Association
Relationship: = - Equivalent
Reference: Murray, M. P. 2000. Wetland plant associations of the western hemlock zone in the central coastal and westslope Cascade Mountains. Unpublished report, Oregon Natural Heritage Program, Portland, OR. 82 pp. [http://www.natureserve.org/nhp/us/or/nw_or_wetlands.pdf]
Related Concept Name: Salix sitchensis/Equisetum arvense-Petasites frigidus Shrubland
Relationship: = - Equivalent
Reference: Crawford, R. C., C. B. Chappell, C. C. Thompson, and F. J. Rocchio. 2009. Vegetation classification of Mount Rainier, North Cascades, and Olympic national parks. Plant association descriptions and identification keys: Appendices A-G. Natural Resource Technical Report NPS/NCCN/NRTR--2009/D-586. National Park Service, Fort Collins, CO. 586 pp.
Related Concept Name: Salix sitchensis/Equisetum arvense Community
Relationship: = - Equivalent
Reference: Chappell, C. B. 1999. Ecological classification of low-elevation riparian vegetation on the Olympic Experimental State Forest: A first approximation. Unpublished progress report. Washing Natural Heritage Program, Washington Department of Natural Resources, Olympia. 43 pp.
Related Concept Name: Salix sitchensis/Equisetum arvense Community Type
Relationship: ? - Undetermined
Reference: Mycek, L. 1994. A classification of riparian plant communities in three geomorphological provinces of the Cascade Mountains in western Washington State. M.S. thesis, University of Washington, Seattle. 122 pp.
Related Concept Name: Salix sitchensis/Equisetum arvense vegetation types (4 variants)
Relationship: ? - Undetermined
Reference: Titus, J. H., P. J. Titus, and R. del Moral. 1999. Wetland development in primary and secondary successional substrates; fourteen years after the eruption of Mount St. Helens, Washington, USA. Northwest Science 73:186-204.
Related Concept Name: Salix sitchensis/Petasites frigidus community
Relationship: ? - Undetermined
Reference: Diaz, N. M., and T. K. Mellen. 1996. Riparian ecological types, Gifford Pinchot and Mt. Hood national forests, and Columbia River Gorge National Scenic Area. Technical Report R6-NR-TP-10-96. USDA Forest Service, Pacific Northwest Region, Portland, OR. 203 pp. plus appendices.
Related Concept Name: Salix sitchensis community
Relationship: ? - Undetermined
Reference: Diaz, N. M., and T. K. Mellen. 1996. Riparian ecological types, Gifford Pinchot and Mt. Hood national forests, and Columbia River Gorge National Scenic Area. Technical Report R6-NR-TP-10-96. USDA Forest Service, Pacific Northwest Region, Portland, OR. 203 pp. plus appendices.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES204.866 North Pacific Montane Riparian Woodland and Shrubland
CES204.869 North Pacific Lowland Riparian Forest and Shrubland


NatureServe Conservation Status
Global Status: G4? (01Oct2002)
Rounded Global Status: G4 - Apparently Secure

Distribution
Color legend for Distribution Map
United States Distribution: WA
Global Distribution: United States

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


Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Salix sitchensis G4 Broad-leaved deciduous shrub Tall shrub/sapling  
 
 
Petasites frigidus G4 Flowering forb Herb (field)    
 
 
Equisetum arvense G4 Fern (Spore-bearing forb) Herb (field)    
 
 


Environmental Setting

Wetland Indicator: Y


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): Crawford et al. (2009)
Element Description Edition Date: 04Jan2016
Element Description Author(s): Crawford et al. (2009)

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


References
  • Chappell, C. B. 1999. Ecological classification of low-elevation riparian vegetation on the Olympic Experimental State Forest: A first approximation. Unpublished progress report. Washing Natural Heritage Program, Washington Department of Natural Resources, Olympia. 43 pp.

  • Crawford, R. C., C. B. Chappell, C. C. Thompson, and F. J. Rocchio. 2009. Vegetation classification of Mount Rainier, North Cascades, and Olympic national parks. Plant association descriptions and identification keys: Appendices A-G. Natural Resource Technical Report NPS/NCCN/NRTR--2009/D-586. National Park Service, Fort Collins, CO. 586 pp.

  • Diaz, N. M., and T. K. Mellen. 1996. Riparian ecological types, Gifford Pinchot and Mt. Hood national forests, and Columbia River Gorge National Scenic Area. Technical Report R6-NR-TP-10-96. USDA Forest Service, Pacific Northwest Region, Portland, OR. 203 pp. plus appendices.

  • Murray, M. P. 2000. Wetland plant associations of the western hemlock zone in the central coastal and westslope Cascade Mountains. Unpublished report, Oregon Natural Heritage Program, Portland, OR. 82 pp. [http://www.natureserve.org/nhp/us/or/nw_or_wetlands.pdf]

  • Mycek, L. 1994. A classification of riparian plant communities in three geomorphological provinces of the Cascade Mountains in western Washington State. M.S. thesis, University of Washington, Seattle. 122 pp.

  • Titus, J. H., P. J. Titus, and R. del Moral. 1999. Wetland development in primary and secondary successional substrates; fourteen years after the eruption of Mount St. Helens, Washington, USA. Northwest Science 73:186-204.

  • 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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