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Trichophorum cespitosum Pacific Fen
Translated Name: Tufted Bulrush Pacific Fen
Unique Identifier: CEGL002679
Classification Approach: International Vegetation Classification (IVC)
Summary: Habitat is montane fens, forming wet lawns on flats or gentle to moderate slopes below springs and seeps. Trichophorum cespitosum forms conspicuous tussocks in montane peatlands but is not common in Oregon. The habitat is similar to other montane fens in similar sloping, seepy sites. Trees have scanty cover and are primarily restricted to hummocks or "tree islands" within a matrix of wet lawn, or they are peripheral to the wetland. Species include Pinus monticola, Thuja plicata, Tsuga heterophylla, and Abies amabilis, but all have low constancy and cover. Nine different species are reported from the shrub layer, the primary one being Vaccinium uliginosum, but these also have low constancy and cover. Over 40 species are reported from the herb layer, most of them typical of wet lawns in fens. Trichophorum cespitosum is most abundant with 44% cover and ranging from 20-75%. Triantha glutinosa is present in all plots but with low cover. Other species with significant patches include Hypericum anagalloides, Caltha leptosepala ssp. howellii, Sanguisorba officinalis, Eriophorum gracile, Carex aquatilis var. dives, and Carex utriculata. Trichophorum cespitosum is uncommon in Oregon, and occurrences of this association are limited to the northern part of the Cascade Range.



Classification

Classification Confidence: Moderate

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 Alkaline Open Fen
Alliance North Pacific Sedge Alkaline Fen

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These data are subject to substantial ongoing revision and may be out of date for some states.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
Washington Trichophorum caespitosum Pacific Fen Equivalent Certain WNHP unpubl. data 2018


Other Related Concepts
Related Concept Name: Trichophorum caespitosum
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: Trichophorum caespitosum 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
CES204.156 Alaskan Pacific Maritime Mountain Hemlock Peatland
CES204.164 Alaskan Pacific Maritime Shore Pine Peatland


NatureServe Conservation Status
Global Status: GNR (01May2000)
Rounded Global Status: GNR - Not Yet Ranked

Distribution
Color legend for Distribution Map
United States Distribution: AKpotentially occurs, OR, WA
Canadian Province Distribution: BCpotentially occurs, NTpotentially occurs, NUpotentially occurs, YTpotentially occurs
Global Distribution: Canadapotentially occurs, United States
Global Range: This association occurs from Oregon to Alaska (Christy 2004).

U.S. Forest Service Ecoregions
Domain Name: Polar Domain
Division Name: Tundra Regime Mountains
Province Name: Brooks Range Tundra - Polar Desert Province
Province Code: M121 Occurrence Status: Predicted or probable
Section Name: Foothills Section
Section Code: M121A Occurrence Status: Predicted or probable
Section Name: Mountains Section
Section Code: M121B Occurrence Status: Predicted or probable


Vegetation


Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Trichophorum caespitosum GNR Graminoid Herb (field)  
 
 


Environmental Setting

Wetland Indicator: Y


Dynamic Processes


Plot Sampling & Classification Analysis

Plots stored in VegBank


Authors/Contributors
Concept Author(s): J.A. Christy (2004)
Element Description Edition Date: 06Apr2012
Element Description Author(s): J.A. Christy (2004)

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. 2004. Native freshwater wetland plant associations of northwestern Oregon. Oregon Natural Heritage Information Center, Oregon State University, Portland, OR.

  • 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.

  • Shephard, M. E. 1995. Plant community ecology and classification of the Yakutat Foreland, Alaska. R10-TP-56. USDA Forest Service, Alaska Region. 213 pp. plus appendices.

  • Viereck, L. A., C. T. Dyrness, A. R. Batten, and K. J. Wenzlick. 1992. The Alaska vegetation classification. General Technical Report PNW-GTR286. USDA Forest Service, Pacific Northwest Research Station, Portland, OR. 278 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