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Vaccinium cespitosum / Sanguisorba officinalis Fen
Translated Name: Dwarf Bilberry / Great Burnet Fen
Unique Identifier: CEGL003438
Classification Approach: International Vegetation Classification (IVC)
Summary: This association occurs on acidic mineral soil around the margins of seasonally wet meadows in the northern Coast Range of Oregon. Trees and tall shrubs are absent. Vaccinium cespitosum forms a network of low thickets and hummocks 0.3-0.5 m in height around openings with seasonally flooded shallow pools with a very sparse cover of Carex obnupta and sheets of the tiny black liverwort Cephaloziella. Vaccinium cespitosum covers 30-70% of the stands, and Sanguisorba officinalis may cover up to 85% of the herb layer. Stunted Spiraea douglasii and Camassia quamash suggest that the soil has very low nutrient status. Thuja plicata, Rhododendron spp., and Gaultheria shallon occur on logs and other elevated microsites and can eventually shade out the association if hydrology is altered or a sufficient area of elevated substrate develops. Sphagnum and Aulacomnium palustre occur among the Vaccinium hummocks and may cover 50-95% of the moss layer. Anemone oregana var. felix is present in these stands.



Classification

Classification Confidence: Moderate
Classification Comments: This association has been sampled at only two sites but is expected to occur in a few other places. Inventories in the central Oregon Coast Range are still incomplete.

Vegetation Hierarchy
Class 2 - Shrub & Herb Vegetation
Subclass 2.C - Shrub & Herb Wetland
Formation 2.C.2 - Temperate to Polar Bog & Fen
Division 2.C.2.Na - North American Bog & Fen
Macrogroup North Pacific Bog & Fen
Group North Pacific Acidic Open Bog & Fen
Alliance Sweetgale - Rose Spirea - Dwarf Bilberry Shrub Fen

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

Similar Associations
Unique Identifier Name
CEGL001140 Vaccinium (cespitosum, scoparium) Dwarf-shrubland



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These data are subject to substantial ongoing revision and may be out of date for some states.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 Vaccinium caespitosum Equivalent Certain Kagan et al. 2004
Washington Vaccinium caespitosum / Sanguisorba officinalis Dwarf-shrubland Equivalent Certain WNHP unpubl. data 2018


Other Related Concepts
Related Concept Name: Vaccinium caespitosum / Sanguisorba officinalis - 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: Vaccinium caespitosum / Sanguisorba officinalis - 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.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES200.998 Temperate Pacific Subalpine-Montane Wet Meadow
CES204.865 North Pacific Shrub Swamp


NatureServe Conservation Status
Global Status: G1 (21Oct2002)
Rounded Global Status: G1 - Critically Imperiled
Reasons: This association is known from only two sites, where it covers 10-20 acres. The percentage of original acreage remaining is unknown. Habitat conditions are highly specific, with seasonal flooding, low nutrient status, and lack of tall-shrub or tree cover required. Existing occurrences are protected, but located in an area of high off-road vehicle use with limited resource protection. Stands are small and could be irreversibly damaged by off-road vehicle use.

Distribution
Color legend for Distribution Map
United States Distribution: OR, WA
Global Distribution: United States
Global Range: This association is currently known only from the northern Coast Range of Oregon. It is possible that it also occurs in coastal mountains of Washington.

U.S. Forest Service Ecoregions
Domain Name: Humid Temperate Domain
Division Name: Marine Regime Mountains
Province Name: Cascade Mixed Forest - Coniferous Forest - Alpine Meadow Province
Province Code: M242 Occurrence Status: Confident or certain
Section Name: Oregon and Washington Coast Ranges Section
Section Code: M242A Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: Trees and tall shrubs are absent. Vaccinium cespitosum forms a network of low thickets and hummocks 0.3-0.5 m in height around openings with seasonally flooded shallow pools with a very sparse cover of Carex obnupta and sheets of the tiny black liverwort Cephaloziella. Vaccinium cespitosum covers 30-70% of the stands, and Sanguisorba officinalis may cover up to 85% of the herb layer. Stunted Spiraea douglasii and Camassia quamash suggest that the soil has very low nutrient status. Thuja plicata, Rhododendron spp., and Gaultheria shallon occur on logs and other elevated microsites and can eventually shade out the association if hydrology is altered or a sufficient area of elevated substrate develops. Sphagnum and Aulacomnium palustre occur among the Vaccinium hummocks and may cover 50-95% of the moss layer. Regional endemic Anemone oregana var. felix is present in these stands.

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Vaccinium caespitosum G1 Broad-leaved deciduous shrub Short shrub/sapling  
 
 
Anemone oregana var. felix G1 Flowering forb Herb (field)      
 
 
Sanguisorba officinalis G1 Flowering forb Herb (field)  
 
 


At-Risk Species Reported for this Association
Scientific Name
  (Common Name)
NatureServe Global Status U.S. Endangered Species Act Status
Anemone oregana var. felix
  (Bog Anemone)
G4T3  


Environmental Setting

Wetland Indicator: Y
Environmental Summary: This association occurs on acidic mineral soil around the margins of seasonally wet meadows in the northern Coast Range of Oregon.


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): J.A. Christy
Element Description Edition Date: 21Oct2002
Element Description Author(s): J.A. Christy
NatureServe Conservation Status Factors Edition Date: 21Oct2002
NatureServe Conservation Status Factors Author(s): J.A. Christy

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. 2001b. Wetland vegetation of Fanno Meadows Preserve, Polk County, Oregon. Report to The Nature Conservancy of Oregon, Portland. Oregon Natural Heritage Program. 17 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.

  • 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