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Vaccinium uliginosum / Deschampsia cespitosa Wet Shrubland
Translated Name: Bog Blueberry / Tufted Hairgrass Wet Shrubland
Unique Identifier: CEGL001250
Classification Approach: International Vegetation Classification (IVC)
Summary: This coastal shrubland association is found in Oregon and Washington and possibly California. The climate is very temperate with the mean temperatures ranging from 7-15C. Precipitation is highly seasonal with most rain falling through the fall and winter months. Mean annual precipitation averages 190 cm. Stands grow in swales and ephemeral bogs with a well-developed iron pan about 30 cm below the soil surface. These strongly leached soils have developed in areas of ancient marine terraces, and their distribution is highly localized. The shrub Vaccinium uliginosum is the dominant plant attaining 40% cover, with occasional patches of Sphagnum spp. and Deschampsia cespitosa. Sanguisorba menziesii and Carex obnupta also occur with high constancy.



Classification

Classification Confidence: Moderate
Classification Comments: The author of this type referred to it as the Vaccinium uliginosum / Carex obnupta - Sanguisorba menziesii community.

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 Northwest Blueberry Wet Shrubland

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These data are subject to substantial ongoing revision and may be out of date for some states.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


Other Related Concepts
Related Concept Name: Bog Blueberry / Tufted Hairgrass Dwarf-shrubland (Vaccinium uliginosum / Deschampsia cespitosa ssp. cespitosa)
Relationship: = - Equivalent
Reference: Christy, J. A., J. S. Kagan, and A. M. Wiedemann. 1998. Plant associations of the Oregon Dunes National Recreation Area - Siuslaw National Forest, Oregon. Technical Paper R6-NR-ECOL-TP-09-98. USDA Forest Service, Pacific Northwest Region, Portland, OR. 196 pp.

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: G2 (15Oct1997)
Rounded Global Status: G2 - Imperiled
Reasons: This community is known only from the immediate coastline, between the California border and central Oregon coast. Winter flooding and summer drought are critical for this community. Sites are either underlain by hardpan, which causes a perched water table, or are situated near lakes where water tables are elevated in winter months. The highly restricted global range of this community, coupled with the small number of known sites and ongoing development in unprotected areas, warrants a high rank.

Distribution
Color legend for Distribution Map
United States Distribution: CApotentially occurs, OR, WA
Global Distribution: United States
Global Range: This community is known from the immediate coastline, between the California border and central Oregon coast. It has also been reported from 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
Division Name: Mediterranean Regime Mountains
Province Name: Sierran Steppe - Mixed Forest - Coniferous Forest - Alpine Meadow Province
Province Code: M261 Occurrence Status: Confident or certain
Section Name: Klamath Mountains Section
Section Code: M261A Occurrence Status: Confident or certain


Vegetation

Vegetation Summary: This association is dominated by the low, broad-leaved deciduous shrub Vaccinium uliginosum, typically less than 0.5 m tall and averaging 40% cover. The herbaceous layer is codominated by perennial grasses and sedges, the most abundant being the densely tufted grass Deschampsia cespitosa and the rhizomatous sedge Carex obnupta, together averaging 50% cover and typically up to 1 m in height. Other grasses occasionally present include Agrostis scabra and Calamagrostis nutkaensis. Forbs are infrequent. Patches of species of the peat-forming moss Sphagnum contribute up to 30% cover.

Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Vaccinium uliginosum G2 Broad-leaved deciduous shrub Short shrub/sapling  
 
 
Sanguisorba menziesii G2 Flowering forb Herb (field)    
 
 
Carex obnupta G2 Graminoid Herb (field)  
 
 
Deschampsia caespitosa G2 Graminoid Herb (field)    
 
 


At-Risk Species Reported for this Association
Scientific Name
  (Common Name)
NatureServe Global Status U.S. Endangered Species Act Status
Sanguisorba menziesii
  (Menzies' Burnet)
G3G4  


Environmental Setting

Wetland Indicator: Y
Environmental Summary: This association occurs in a coastal region on elevated marine terraces. The climate is strongly marine-dominated, with average annual precipitation of 190 cm, most of which occurs during late fall and winter as rain. Temperatures are greatly moderated by the oceanic influence. Persistent, strong onshore winds are another climatic factor of some importance, and winter storms can often have winds exceeding 120 kilometers/hour.

This association is found on level, marine coastal terraces, elevated approximately 40 m above sea level, and underlain by tuffaceous, indurated sandstone. The terraces are covered by strongly leached, nutrient-poor soils derived from fossil sand dunes and marine deposits, called Blacklock soils. These soils have an impenetrable iron hardpan in the B2 horizon that has developed at a depth of 30 to 76 cm, and is 15 to 30 cm thick. The A horizon ranges in texture from sandy loam to loam. A perched water table is the result of the iron pan, and during the winter rains the entire surface of the terrace is flooded.

The surface of these terraces is marked by a pattern of ridges and swales, in linear formations, which are apparently a series of "fossilized" sand dunes. The swales hold water much longer into the growing season, and in some locations larger depressions support what can best be characterized as ephemeral bogs. In some cases, circular ponds persist in these depressions into late summer. These ephemeral bogs are where this association occurs.


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): M.S. Reid
Element Description Edition Date: 19Sep2016
Element Description Author(s): M.S. Reid, M. Schindel and J.A. Christy
NatureServe Conservation Status Factors Edition Date: 15Oct1997
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
  • Bourgeron, P. S., and L. D. Engelking, editors. 1994. A preliminary vegetation classification of the western United States. Unpublished report. The Nature Conservancy, Western Heritage Task Force, Boulder, CO. 175 pp. plus appendix.

  • Christy, J. A., J. S. Kagan, and A. M. Wiedemann. 1998. Plant associations of the Oregon Dunes National Recreation Area - Siuslaw National Forest, Oregon. Technical Paper R6-NR-ECOL-TP-09-98. USDA Forest Service, Pacific Northwest Region, Portland, OR. 196 pp.

  • Hemstrom, M. A., S. E. Logan, and W. Pavlat. 1987. Plant association and management guide, Willamette National Forest. Report R6-Ecol 257-B-86. USDA Forest Service, Pacific Northwest Region, Portland, OR. 312 pp.

  • 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.

  • Martin, R. C., and R. E. Frenkel. 1978. Preserve analysis: Blacklock Point. Oregon Natural Area Preserves Advisory Committee to the State Land Board, Salem, OR. 63 pp.

  • Titus, J. H., and J. A. Christy. 1996a. Vegetation of Big Marsh, Deschutes National Forest, Oregon. Report to Deschutes National Forest. Oregon Natural Heritage Program, The Nature Conservancy, Portland.

  • 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