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Classification
Scientific Name: Willamette Valley Wet Prairie
Unique Identifier: CES204.874
Classification Confidence: 1 - Strong
Image 22095
© Alan D. St. John
Summary: This system is largely restricted to the Willamette Valley of Oregon and adjacent Washington. It is nearly extirpated from the Puget Trough of Washington. These are high-nutrient wetlands that are temporarily and seasonally flooded. They are dominated primarily by graminoids, especially Deschampsia cespitosa, Camassia quamash, Carex densa, and Carex unilateralis, and to a lesser degree by forbs (e.g., Isoetes nuttallii) or shrubs (e.g., Rosa nutkana). Wet prairies historically covered large areas of the Willamette Valley where they were maintained by a combination of wetland soil hydrology and frequent burning. They have been reduced to tiny fragments of their former extent.

Classification Approach: International Terrestrial Ecological Systems Classification (ITESC)


Component Associations
Association Unique ID Association Name
CEGL001604 Deschampsia cespitosa - Danthonia californica Marsh
CEGL001801 Carex aperta Lowland Wet Meadow
CEGL001833 Eleocharis palustris Marsh
CEGL003341 Camassia quamash Lowland Wet Prairie
CEGL003343 Isoetes nuttallii Wet Meadow
CEGL003344 Rosa nutkana / Deschampsia cespitosa Shrubland
CEGL003411 Eleocharis palustris - Carex unilateralis Wet Meadow
CEGL003425 Deschampsia cespitosa - Artemisia lindleyana Marsh
CEGL003455 Carex densa - Deschampsia cespitosa Wet Prairie
CEGL003456 Carex densa - Eleocharis palustris Wet Prairie
CEGL003457 Rosa nutkana / Oenanthe sarmentosa Shrubland



Classifiers

Land Cover Class: Herbaceous Wetland
Spatial Pattern: Small patch
Natural/Seminatural: No
Vegetated ( > 10% vascular cover):
Upland: No
Wetland: Yes
Isolated Wetland: Partially Isolated

Non-diagnostic Classifiers
Primary Classifier Secondary Classifier
Lowland Lowland
Herbaceous  
Extensive Wet Flat  
Isolated Wetland Partially Isolated
Saturated Soil  

At-Risk Species Reported for this Ecological System
Scientific Name
  (Common Name)
NatureServe Global Status U.S. Endangered Species Act Status
Batrachoseps wrightorum
  (Oregon Slender Salamander)
G3  
Delphinium pavonaceum
  (Peacock Larkspur)
G1Q  
Filipendula occidentalis
  (Queen-of-the-Forest)
G2G3  
Icaricia icarioides fenderi
  (Fender's Blue)
G5T1 LE: Listed endangered
Icaricia saepiolus littoralis
  (Coastal Greenish Blue)
G5T1T3  
Lilium occidentale
  (Western Lily)
G1G2 LE: Listed endangered
Lomatium bradshawii
  (Bradshaw's Desert-parsley)
G2 LE: Listed endangered
Perideridia erythrorhiza
  (Red-root Yampah)
G2  
Rana pretiosa
  (Oregon Spotted Frog)
G2 LT: Listed threatened
Speyeria zerene hippolyta
  (Oregon Silverspot)
G5T1 LT, XN: Listed threatened, nonessential experimental population

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Char-
acter-
istic
Domi-nant Con-stant
Cover Class %
Con-
stancy
%
Camassia quamash G5 Flowering forb Herb (field)  
 
 
Delphinium pavonaceum G1 Flowering forb Herb (field)      
 
 
Filipendula occidentalis G2 Flowering forb Herb (field)      
 
 
Lilium occidentale G1 Flowering forb Herb (field)      
 
 
Lomatium bradshawii G2 Flowering forb Herb (field)    
 
 
Perideridia erythrorhiza G2 Flowering forb Herb (field)    
 
 
Carex densa G5 Graminoid Herb (field)    
 
 
Carex unilateralis G5 Graminoid Herb (field)    
 
 
Danthonia californica G5 Graminoid Herb (field)    
 
 
Deschampsia caespitosa G5 Graminoid Herb (field)    
 
 


Animal Species Reported for this Ecological System
Scientific Name
  (Common Name)
Global Status U.S. Endangered Species Act Status Charact-
eristic
Exotic
Batrachoseps wrightorum
  (Oregon Slender Salamander)
G3      
Hyliola regilla
  (Pacific Treefrog)
G5      
Icaricia icarioides fenderi
  (Fender's Blue)
G5T1 LE: Listed endangered    
Icaricia saepiolus littoralis
  (Coastal Greenish Blue)
G5T1T3      
Microtus townsendii
  (Townsend's Vole)
G5      
Rana pretiosa
  (Oregon Spotted Frog)
G2 LT: Listed threatened    
Sorex vagrans
  (Vagrant Shrew)
G5      
Speyeria zerene hippolyta
  (Oregon Silverspot)
G5T1 LT, XN: Listed threatened, nonessential experimental population    
Thamnophis ordinoides
  (Northwestern Gartersnake)
G5      
Thamnophis sirtalis
  (Common Gartersnake)
G5      


Distribution
Color legend for Distribution Map
Nation: United States
United States Distribution: OR, WA
Global Range: Restricted to the Willamette Valley of Oregon and adjacent Washington.

Biogeographic Divisions
Division Code and Name Primary Occurrence Status
204-North American Pacific Maritime C: Confident or certain

The Nature Conservancy's Conservation Ecoregions
Code Name Occurrence Status
2 Puget Trough - Willamette Valley - Georgia Basin Confident or certain

MRLC 2000 Mapzones
Code Name Occurrence Status
1 Northern Cascades Confident or certain
2 Oregon Coastal Range Confident or certain
7 Cascade Mountain Range Confident or certain

National Mapping
ESLF Code (Ecological System Lifeform): 9221

West Landfire Legend: No
East Landfire Legend: No

Authors/Contributors
Element Description Edition Date: 14Jan2014
Element Description Author(s): C. Chappell and G. Kittel

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., and J. Christy. 2004. Willamette Valley-Puget Trough-Georgia Basin Ecoregion Terrestrial Ecological System EO Specs and EO Rank Specs. Appendix 11 in: J. Floberg, M. Goering, G. Wilhere, C. MacDonald, C. Chappell, C. Rumsey, Z. Ferdana, A. Holt, P. Skidmore, T. Horsman, E. Alverson, C. Tanner, M. Bryer, P. Lachetti, A. Harcombe, B. McDonald, T. Cook, M. Summers, and D. Rolph. Willamette Valley-Puget Trough-Georgia Basin Ecoregional Assessment, Volume One: Report prepared by The Nature Conservancy with support from The Nature Conservancy of Canada, Washington Department of Fish and Wildlife, Washington Department of Natural Resources (Natural Heritage and Nearshore Habitat programs), Oregon State Natural Heritage Information Center and the British Columbia Conservation Data Centre.

  • Comer, P., D. Faber-Langendoen, R. Evans, S. Gawler, C. Josse, G. Kittel, S. Menard, C. Nordman, M. Pyne, M. Reid, M. Russo, K. Schulz, K. Snow, J. Teague, and R. White. 2003-present. Ecological systems of the United States: A working classification of U.S. terrestrial systems. NatureServe, Arlington, VA.

  • Easterly, R. T., D. L. Salstrom, and C. B. Chappell. 2005. Wet prairie swales of the South Puget Sound, Washington. Report submitted to South Puget Sound Office of The Nature Conservancy, Olympia, WA. [http://www.southsoundprairies.org/documents/WetPrairieSwalesofSPS2005_000.pdf]

  • Littell, J. S., M. McGuire Elsner, L. C. Whitely Binder, and A. K. Snover, editors. 2009. The Washington climate change impacts assessment: Evaluating Washington's future in a changing climate. Executive summary. Climate Impacts Group, University of Washington, Seattle. [www.cses.washington.edu/db/pdf/wacciaexecsummary638.pdf]

  • WNHP [Washington Natural Heritage Program]. 2011. Ecological integrity assessments for the ecological systems of Washington. Version: 2.22.2011. Washington Natural Heritage Program, Department of Natural Resources, Olympia. [http://www1.dnr.wa.gov/nhp/refdesk/communities/eia_list.html] (accessed September 9, 2013).

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


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