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Classification
Scientific Name: North Pacific Dry Douglas-fir-(Madrone) Forest and Woodland
Unique Identifier: CES204.845
Classification Confidence: 1 - Strong

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Summary: This ecological system is most common in the Puget Trough - Willamette Valley ecoregion of Oregon and Washington but also occurs in adjacent ecoregions. It occupies small patches associated with dry sites or larger areas in prairie landscapes. This system historically had moderate- to low-severity fires moderately frequently. Historically, these communities were either part of larger forested landscapes or occupied sheltered topographic positions in prairie-dominated landscapes. They now also occur on some sites that formerly supported prairies or tall shrublands (Corylus cornuta) with scattered trees. In the mountains, this type occurs locally on dry sites within dry to mesic (for the coastal areas) climates up to about 1220 m (4000 feet) elevation. This is a forest or woodland primarily dominated by the long-lived conifer Pseudotsuga menziesii. The broadleaf evergreen Arbutus menziesii, the short-lived conifer Pinus contorta, the broadleaf deciduous Acer macrophyllum, and the shade-tolerant conifer Abies grandis are local dominant or codominant species. These sites are too dry and warm or have been too frequently and extensively burned for anything more than small amounts of Tsuga heterophylla or Thuja plicata to be present as regeneration. Arbutus menziesii dominance is favored by high-severity fires on sites where it occurs, and Pseudotsuga menziesii can be locally eliminated by logging and hot fire or repeated high-severity fires. Calocedrus decurrens is absent. Abies grandis can be an important subcanopy or sapling tree, especially in and around the Willamette Valley and in the driest portions of the Georgia Basin (Coastal Douglas-fir Zone).

Classification Approach: International Terrestrial Ecological Systems Classification (ITESC)

Classification Comments: Originally named Dry Douglas-fir and Madrone Forest and Woodland, its name was changed as many areas occur without madrone. However, note that the description states we can have madrone stands with no Douglas-fir; these are less common than the former.

Similar Ecological Systems
Unique Identifier Name
CES206.916 Mediterranean California Dry-Mesic Mixed Conifer Forest and Woodland


Component Associations
Association Unique ID Association Name
CEGL000150 Pinus contorta var. contorta - Pseudotsuga menziesii / Gaultheria shallon Forest
CEGL000422 Pseudotsuga menziesii - Arbutus menziesii / Holodiscus discolor Forest
CEGL000456 Pseudotsuga menziesii / Holodiscus discolor - Rosa gymnocarpa / Festuca occidentalis Forest
CEGL000460 Pseudotsuga menziesii / Holodiscus discolor - Symphoricarpos albus Forest
CEGL000927 Arbutus menziesii - Pseudotsuga menziesii - Quercus spp. / Toxicodendron diversilobum Woodland
CEGL003350 Pseudotsuga menziesii - Abies grandis / Symphoricarpos albus / Melica subulata Forest
CEGL003375 Pinus contorta var. contorta - Pseudotsuga menziesii / Cladonia spp. Forest
CEGL005531 Pseudotsuga menziesii / Gaultheria shallon - Holodiscus discolor Forest



Classifiers

Land Cover Class: Forest and Woodland
Spatial Pattern: Large patch, Small patch
Natural/Seminatural: No
Vegetated ( > 10% vascular cover):
Upland: Yes
Wetland: No
Isolated Wetland: No

Diagnostic Classifiers
Primary Classifier Secondary Classifier
Forest and Woodland (Treed)  
F-Patch/Medium Intensity  
Pseudotsuga menziesii  
Arbutus menziesii  

Non-diagnostic Classifiers
Primary Classifier Secondary Classifier
Lowland Foothill
Temperate Temperate Oceanic

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 nuttallii ssp. ochroleucum
  (White-rock Larkspur)
G4T2  
Deroceras hesperium
  (Evening Fieldslug)
G2Q  
Erigeron howellii
  (Howell's Fleabane)
G2  
Erythronium elegans
  (Coast Range Fawnlily)
G2  
Lathyrus holochlorus
  (Thinleaf Peavine)
G2?  
Meconella oregana
  (White Meconella)
G2G3  
Monadenia chaceana
  (Siskiyou Shoulderband)
G2G3  
Monadenia fidelis celeuthia
  (Pacific Sideband)
G4G5T1  
Monadenia fidelis ssp. 2
  (Umpqua Sideband)
G4G5T1  
Odocoileus virginianus leucurus
  (Columbian White-tailed Deer)
G5T3Q  
Phaeocollybia californica
  (a fungus)
G3  
Phaeocollybia dissiliens
  (a fungus)
G2G3  
Phaeocollybia oregonensis
  (a fungus)
G2?  
Rhizopogon brunneiniger
  (a fungus)
G2G3  
Russula stewartii
  (a fungus)
G1  
Sullivantia oregana
  (Oregon Sullivantia)
G2  
Thomomys bottae detumidus
  (Pistol River Pocket Gopher)
G5T2Q  
Trilobopsis loricata
  (Scaly Chaparral)
G2G3  

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Char-
acter-
istic
Domi-nant Con-stant
Cover Class %
Con-
stancy
%
Acer macrophyllum G5 Broad-leaved deciduous tree Tree (canopy & subcanopy)    
 
 
Arbutus menziesii G5 Broad-leaved evergreen tree Tree canopy  
 
 
Abies grandis G5 Needle-leaved tree Tree canopy    
 
 
Pinus contorta G5 Needle-leaved tree Tree canopy    
 
 
Pseudotsuga menziesii G5 Needle-leaved tree Tree canopy    
 
 
Holodiscus discolor G5 Broad-leaved deciduous shrub Shrub/sapling (tall & short)    
 
 
Rosa gymnocarpa G5 Dwarf-shrub Short shrub/sapling    
 
 
Delphinium nuttallii ssp. ochroleucum T2 Flowering forb Herb (field)      
 
 
Erigeron howellii G2 Flowering forb Herb (field)      
 
 
Erythronium elegans G2 Flowering forb Herb (field)      
 
 
Lathyrus holochlorus G2 Flowering forb Herb (field)      
 
 
Meconella oregana G2 Flowering forb Herb (field)      
 
 
Sullivantia oregana G2 Flowering forb Herb (field)      
 
 
Phaeocollybia californica G3 Non-plant Nonvascular      
 
 
Phaeocollybia dissiliens G2 Non-plant Nonvascular      
 
 
Phaeocollybia oregonensis G2 Non-plant Nonvascular      
 
 
Rhizopogon brunneiniger G2 Non-plant Nonvascular      
 
 
Russula stewartii G1 Non-plant Nonvascular      
 
 


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      
Deroceras hesperium
  (Evening Fieldslug)
G2Q      
Elgaria coerulea
  (Northern Alligator Lizard)
G5      
Ensatina eschscholtzii
  (Ensatina)
G5      
Monadenia chaceana
  (Siskiyou Shoulderband)
G2G3      
Monadenia fidelis celeuthia
  (Pacific Sideband)
G4G5T1      
Monadenia fidelis ssp. 2
  (Umpqua Sideband)
G4G5T1      
Neotamias townsendii
  (Townsend's Chipmunk)
G5      
Odocoileus virginianus leucurus
  (Columbian White-tailed Deer)
G5T3Q      
Peromyscus maniculatus
  (North American Deermouse)
G5      
Sorex trowbridgii
  (Trowbridge's Shrew)
G5      
Thamnophis ordinoides
  (Northwestern Gartersnake)
G5      
Thomomys bottae detumidus
  (Pistol River Pocket Gopher)
G5T2Q      
Trilobopsis loricata
  (Scaly Chaparral)
G2G3      


Distribution
Color legend for Distribution Map
Nation: United States
United States Distribution: OR, WA
Nation: Canada
Canadian Province Distribution: BC
Global Range: This system is limited to the foothill transition zone of the Puget Trough - Willamette Valley - Georgia Basin ecoregion.

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
1 Pacific Northwest Coast Confident or certain
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
3 Northern California Coastal Range Possible
7 Cascade Mountain Range Confident or certain

National Mapping
ESLF Code (Ecological System Lifeform): 4222
ESP Code (Environmental Site Potential): 1035
EVT Code (Existing Vegetation Type): 2035

West Landfire Legend: Yes
East Landfire Legend: No

Authors/Contributors
Element Description Edition Date: 02Feb2007
Element Description Author(s): C. Chappell

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.

  • Eyre, F. H., editor. 1980. Forest cover types of the United States and Canada. Society of American Foresters, Washington, DC. 148 pp.

  • Franklin, J. F., and C. T. Dyrness. 1973. Natural vegetation of Oregon and Washington. General Technical Report PNW-8. USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, Portland, OR. 417 pp.

  • Green, R. N., and K. Klinka. 1994. A field guide to site interpretation for the Vancouver Forest Region. British Columbia Ministry of Forests. ISSN 0229-1622 Land Management Handbook 28. 285 pp.

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


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