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Carex aquatilis var. dives Fen
Translated Name: Sitka Sedge Fen
Unique Identifier: CEGL001826
Classification Approach: International Vegetation Classification (IVC)
Summary: Habitat is usually montane fens. The association is widespread and important in the Cascade Range and, like Carex aquatilis Wet Meadow (CEGL001802), includes a heterogeneous mix of species that do not segregate in any meaningful way. Trees and shrubs are scarce, although many different species are present. The herb layer is astonishingly diverse with more than 120 species recorded, but most of these have relatively low constancy and reflect the patchy distribution of many different taxa. Carex aquatilis var. dives is the primary species, averaging 54% cover, and many stands occur as monotypic reed swamp with cover ranging from 5 to 99%. Some of these stands intergrade with Carex utriculata Wet Meadow (CEGL001562) in seasonally flooded depressions. Dodecatheon jeffreyi, Carex utriculata, and Hypericum anagalloides are the only other species with constancy higher than 20%. Species with significant patches include Caltha leptosepala ssp. howellii, Eleocharis quinqueflora, Equisetum fluviatile, Viola macloskeyi, Cicuta douglasii, and Agrostis humilis. Stands may occur on old beaver terraces on seepage slopes and also in sag ponds on slopes prone to slumping. Carex aquatilis var. dives can intermix with forest ecotone or meadow taxa as long as enough soil moisture is present. Plants become progressively dwarfed as conditions become drier.



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.

Similar Associations
Unique Identifier Name
CEGL001802 Carex aquatilis Wet Meadow



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These data are subject to substantial ongoing revision and may be out of date for some states.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 Carex aquatilis var. dives Equivalent Certain Kagan et al. 2004


Other Related Concepts
Related Concept Name: Carex aquatilis association
Relationship: = - Equivalent
Reference: Odion, D. C., D. A. DiPaolo, L. C. Groshong, D. A. Sarr, and S. Mohren. 2013. Vegetation Inventory Project: Oregon Caves National Monument and proposed expansion area. Natural Resource Technical Report NPS/ORCA/NRTR--2013/782. National Park Service, Fort Collins, CO. 272 pp.
Related Concept Name: Carex aquatilis var. dives
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.
Relationship: = - Equivalent
Reference: Murray, M. P. 2000. Wetland plant associations of the western hemlock zone in the central coastal and westslope Cascade Mountains. Unpublished report, Oregon Natural Heritage Program, Portland, OR. 82 pp. [http://www.natureserve.org/nhp/us/or/nw_or_wetlands.pdf]
Related Concept Name: Carex aquatilis var. dives (C. sitchensis) Association
Relationship: = - Equivalent
Reference: Crowe, E. A., B. L. Kovalchik, and M. J. Kerr. 2004. Riparian and wetland vegetation of central and eastern Oregon. Oregon Natural Heritage Information Center, Institute for Natural Resources, Oregon State University, Portland. 473 pp. [http://oregonstate.edu/ornhic/ publications.html]
Related Concept Name: Carex aquatilis var. dives 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.
Related Concept Name: Carex aquatilis community
Relationship: ? - Undetermined
Reference: Crawford, R. C. 2003. Riparian vegetation classification of the Columbia Basin, Washington. Natural Heritage Report 2003-03. Washington Natural Heritage Program, Washington Department of Natural Resources, Olympia. 98 pp. plus appendices.
Related Concept Name: Carex sitchensis - Potentilla palustris variant
Relationship: = - Equivalent
Reference: Kunze, L. M. 1994. Preliminary classification of native, low elevation, freshwater wetland vegetation in western Washington. Washington State Department of Natural Resources, Natural Heritage Program. 120 pp.
Related Concept Name: Carex sitchensis / Equisetum fluviatile (Sitka sedge/swamp horsetail) Community Type
Relationship: ? - Undetermined
Reference: 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.
Related Concept Name: Carex sitchensis
Relationship: = - Equivalent
Reference: Kovalchik, B. L. 1987. Riparian zone associations - Deschutes, Ochoco, Fremont, and Winema national forests. Technical Paper 279-87. USDA Forest Service, Pacific Northwest Region, Portland, OR. 171 pp.
Related Concept Name: Carex sitchensis Community Type
Relationship: ? - Undetermined
Reference: Boggs, K. 2000. Classification of community types, successional sequences and landscapes of the Copper River Delta, Alaska. General Technical Report PNW-GTR-469. USDA Forest Service, Pacific Northwest Research Station, Portland, OR. March 2000. 244 pp.

Ecological Systems Placement

Ecological Systems Placement
Ecological System Unique ID Ecological System Name
CES103.872 Western Canadian Boreal Shrub-Sedge Rich and Alkaline Fen
CES105.124 Western North American Boreal Wet Meadow
CES204.063 North Pacific Bog and Fen
CES204.158 Alaskan Pacific Maritime Fen and Wet Meadow
CES306.812 Rocky Mountain Alpine-Montane Wet Meadow


NatureServe Conservation Status
Global Status: G4 (01Feb1996)
Rounded Global Status: G4 - Apparently Secure

Distribution
Color legend for Distribution Map
United States Distribution: AK, CApotentially occurs, OR, WA
Canadian Province Distribution: BC
Global Distribution: Canada, United States
Global Range: This association occurs from northern California to Alaska (Christy 2004).

U.S. Forest Service Ecoregions
Domain Name: Humid Temperate Domain
Division Name: Marine Division
Province Name: Pacific Lowland Mixed Forest Province
Province Code: 242 Occurrence Status: Confident or certain
Section Name: Willamette Valley and Puget Trough Section
Section Code: 242A Occurrence Status: Confident or certain
Domain Name: Dry Domain
Division Name: Temperate Desert Division
Province Name: Intermountain Semi-Desert Province
Province Code: 342 Occurrence Status: Confident or certain
Section Name: Northwestern Basin and Range Section
Section Code: 342B Occurrence Status: Confident or certain
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: Western Cascades Section
Section Code: M242B Occurrence Status: Possible
Section Name: Eastern Cascades Section
Section Code: M242C 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: Modoc Plateau Section
Section Code: M261G Occurrence Status: Confident or certain
Domain Name: Dry Domain
Division Name: Temperate Steppe Regime Mountains
Province Name: Middle Rocky Mountain Steppe - Coniferous Forest - Alpine Meadow Province
Province Code: M332 Occurrence Status: Confident or certain
Section Name: Blue Mountains Section
Section Code: M332G Occurrence Status: Confident or certain


Vegetation


Vegetation Composition (incomplete)
Species Name Rounded Global Status Growth Form Stratum Charact-
eristic
Dominant Constant
Cover Class %
Con-
stancy
%
Carex aquatilis var. dives G4 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: 10Jun2006
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
  • Boggs, K. 2000. Classification of community types, successional sequences and landscapes of the Copper River Delta, Alaska. General Technical Report PNW-GTR-469. USDA Forest Service, Pacific Northwest Research Station, Portland, OR. March 2000. 244 pp.

  • 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.

  • Campbell, A. G. 1973. Vegetative ecology of Hunts Cove, Mt. Jefferson, OR. M.S. thesis, Oregon State University, Corvallis. 89 pp.

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

  • Crawford, R. C. 2003. Riparian vegetation classification of the Columbia Basin, Washington. Natural Heritage Report 2003-03. Washington Natural Heritage Program, Washington Department of Natural Resources, Olympia. 98 pp. plus appendices.

  • Crowe, E. A., B. L. Kovalchik, and M. J. Kerr. 2004. Riparian and wetland vegetation of central and eastern Oregon. Oregon Natural Heritage Information Center, Institute for Natural Resources, Oregon State University, Portland. 473 pp. [http://oregonstate.edu/ornhic/ publications.html]

  • Frenkel, R. E., W. H. Moir, and J. A. Christy. 1986. Vegetation of Torrey Lake Mire, central Cascade Range, Oregon. Madrono 33:24-39.

  • 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., E. M. Nielsen, M. D. Noone, J. C. van Warmerdam, L. K. Wise, G. Kittel, and C. Copass. 2012. Lewis and Clark National Historic Park vegetation classification and mapping project report. Natural Resource Report NPS/NCCN/NRR--2012/597. National Park Service, Fort Collins, CO.

  • 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.

  • Kovalchik, B. L. 1987. Riparian zone associations - Deschutes, Ochoco, Fremont, and Winema national forests. Technical Paper 279-87. USDA Forest Service, Pacific Northwest Region, Portland, OR. 171 pp.

  • Kovalchik, B. L. 2001. Classification and management of aquatic, riparian and wetland sites on the national forests of eastern Washington. Part 1: The series descriptions. 429 pp. plus appendix. [http://www.reo.gov/col/wetland_classification/wetland_classification.pdf]

  • Kunze, L. M. 1994. Preliminary classification of native, low elevation, freshwater wetland vegetation in western Washington. Washington State Department of Natural Resources, Natural Heritage Program. 120 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.

  • Murray, M. P. 2000. Wetland plant associations of the western hemlock zone in the central coastal and westslope Cascade Mountains. Unpublished report, Oregon Natural Heritage Program, Portland, OR. 82 pp. [http://www.natureserve.org/nhp/us/or/nw_or_wetlands.pdf]

  • Odion, D. C., D. A. DiPaolo, L. C. Groshong, D. A. Sarr, and S. Mohren. 2013. Vegetation Inventory Project: Oregon Caves National Monument and proposed expansion area. Natural Resource Technical Report NPS/ORCA/NRTR--2013/782. National Park Service, Fort Collins, CO. 272 pp.

  • Roach, A. W. 1952. Phytosociology of the Nash Crater lava flows, Linn County, Oregon. Ecological Monographs 22:169-193.

  • Seyer, S. C. 1979. Vegetative ecology of a montane mire, Crater Lake National Park, Oregon. Unpublished thesis, Oregon State University, Corvallis. 87 pp.

  • Seyer, S. C. 1983. Ecological analysis, Multorpor Fen Preserve, Oregon. The Nature Conservancy, Oregon Field Office, Portland. 28 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.

  • Titus, J. H. 1996. Unpublished vegetation data for French Flat, Bruno Meadows, Hill Creek, and Tater Hill. Oregon Natural Heritage Program, The Nature Conservancy, Portland.

  • 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.

  • Wilson, C. E. 1986. Floristic and edaphic aspects of vegetational patterns in subalpine mires of the Cascade Mountains of Oregon. M.S. thesis, University of Oregon, Eugene. 59 pp.


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