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CEGL005541 Pseudotsuga menziesii - Tsuga heterophylla / Mahonia nervosa Forest

Type Concept Sentence: No Data Available

Common (Translated Scientific) Name: Douglas-fir - Western Hemlock / Cascade Barberry Forest

Colloquial Name: No Data Available

Hierarchy Level:  Association

Type Concept: This Douglas-fir - western hemlock forest occurs in Washington and Oregon and possibly British Columbia. The typically closed canopy is dominated by Pseudotsuga menziesii or codominated by that species and Tsuga heterophylla. Tsuga heterophylla typically dominates tree regeneration and always occupies over 10% total cover. This type includes stands with earlier-seral trees, such as Pinus contorta. The shrub layer varies from sparse to dense. Mahonia nervosa is always present and typically prominent to dominant. Acer circinatum is often present to dominant in a well-developed tall-shrub layer. Vaccinium parvifolium or Paxistima myrsinites are usually present. The herb layer is usually poorly developed with shade-tolerant species such as Chimaphila umbellata and Goodyera oblongifolia usually present. Polystichum munitum and Linnaea borealis are frequently present, the former always with under 3% cover. This association occurs in the northern and eastern Olympics and in the Cascade Range at low to middle elevations. Sites have well-drained, often shallow soils and are located on steep mid to upper slopes and ridgetops. This association occurs on dry topographic positions.

Diagnostic Characteristics: No Data Available

Rationale for Nominal Species or Physiognomic Features: No Data Available

Classification Comments: No Data Available

Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available

Floristics: The typically closed canopy is dominated by Pseudotsuga menziesii or codominated by that species and Tsuga heterophylla. Tsuga heterophylla typically dominates tree regeneration and always occupies over 10% total cover. This type includes stands with earlier-seral trees, such as Pinus contorta. The shrub layer varies from sparse to dense. Mahonia nervosa (= Berberis nervosa) is always present and typically prominent to dominant. Acer circinatum is often present to dominant in a well-developed tall-shrub layer. Vaccinium parvifolium or Paxistima myrsinites are usually present. The herb layer is usually poorly developed with shade-tolerant species such as Chimaphila umbellata and Goodyera oblongifolia usually present. Polystichum munitum and Linnaea borealis are frequently present, the former always with under 3% cover.

Dynamics:  No Data Available
Environmental Description:  No Data Available
Geographic Range: No Data Available

Nations: CA?,US

States/Provinces:  BC?, OR, WA


Confidence Level: Low - Poorly Documented

Confidence Level Comments: No Data Available
Grank: G4

Greasons: No Data Available
Type Name Database Code Classification Code
Class 1 Forest & Woodland Class C01 1
Subclass 1.B Temperate & Boreal Forest & Woodland Subclass S15 1.B
Formation 1.B.2 Cool Temperate Forest & Woodland Formation F008 1.B.2
Division 1.B.2.Nd Vancouverian Forest & Woodland Division D192 1.B.2.Nd
Macrogroup 1.B.2.Nd.3 Western Hemlock - Sitka Spruce - Redwood Rainforest Macrogroup M024 1.B.2.Nd.3
Group 1.B.2.Nd.3.c Douglas-fir - Western Hemlock / Salal Rainforest Group G240 1.B.2.Nd.3.c
Alliance A3378 Western Hemlock - Douglas-fir / Western Cordilleran Bunchberry Mesic Forest Alliance A3378 1.B.2.Nd.3.c
Association CEGL005541 Douglas-fir - Western Hemlock / Cascade Barberry Forest CEGL005541 1.B.2.Nd.3.c
Concept Lineage: No Data Available

Predecessors: No Data Available

Obsolete Names: No Data Available

Obsolete Parents: No Data Available
Synonomy: > Pseudotsuga menziesii - Tsuga heterophylla / Mahonia nervosa var. nervosa (Kagan et al. 2004)
= Pseudotsuga menziesii - Tsuga heterophylla / Mahonia nervosa (Chappell 2006b) [17 plots]
= Pseudotsuga menziesii - Tsuga heterophylla / Mahonia nervosa (Chappell 1997)
= Pseudotsuga menziesii-Tsuga heterophylla/Mahonia nervosa (Meidinger et al. 2005) [PNWCOAST_189]
= Pseudotsuga menziesii-Tsuga heterophylla/Mahonia nervosa Forest (Crawford et al. 2009) [PNWCOAST_189]
>< Tsuga heterophylla / Berberis nervosa - Gaultheria shallon (Topik et al. 1986)
>< Tsuga heterophylla / Berberis nervosa (Henderson et al. 1989)
>< Tsuga heterophylla / Berberis nervosa (Henderson et al. 1992)
>< Tsuga heterophylla / Berberis nervosa (Topik et al. 1986)
>< Tsuga heterophylla / Gaultheria shallon - Berberis nervosa (Henderson et al. 1992)
>< Tsuga heterophylla / Gaultheria shallon - Berberis nervosa (Henderson et al. 1989)
>< Tsuga heterophylla / Mahonia nervosa var. nervosa - Gaultheria shallon (Kagan et al. 2004)
>< Tsuga heterophylla / Mahonia nervosa var. nervosa (Kagan et al. 2004)
>< Western hemlock / dwarf Oregon-grape (TSHE/BENE) (Hemstrom and Logan 1986)
>< Western hemlock / dwarf Oregon-grape - salal (TSHE/BENE-GASH) (Hemstrom and Logan 1986)
Concept Author(s): Meidinger et al. (2005)

Author of Description: Crawford et al. (2009)

Acknowledgements: No Data Available

Version Date: 05-11-16
  • 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.
  • Chappell, C. B. 1997. Terrestrial forested plant associations of the Puget Lowland. Draft report. Washington Natural Heritage Program, Washington Department of Natural Resources, Olympia. 36 pp.
  • Chappell, C. B. 2006b. Upland plant associations of the Puget Trough ecoregion, Washington. Natural Heritage Report 2006-01. Washington Department of Natural Resources, Natural Heritage Program, Olympia, WA. [http://www.dnr.wa.gov/nhp/refdesk/communities/pdf/intro.pdf]
  • Crawford, R. C., C. B. Chappell, C. C. Thompson, and F. J. Rocchio. 2009. Vegetation classification of Mount Rainier, North Cascades, and Olympic national parks. Plant association descriptions and identification keys: Appendices A-G. Natural Resource Technical Report NPS/NCCN/NRTR--2009/D-586. National Park Service, Fort Collins, CO. 586 pp.
  • Halverson, N. M., C. Topik, and R. van Vickle. 1986. Plant association and management guide for the western hemlock zone Mt. Hood National Forest. R6-ECOL-232A-1986. USDA Forest Service, Pacific Northwest Region, Portland, OR. 111 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.
  • Hemstrom, M. A., and S. E. Logan. 1986. Plant association and management guide Siuslaw National Forest. Report R6-Ecol 220-1986a. USDA Forest Service, Pacific Northwest Region, Portland, OR. 121 pp.
  • Henderson, J. A. 1981. Preliminary plant associations and habitat types of the White River District, Mt. Baker-Snoqualmie National Forest. Unpublished report prepared for USDA Forest Service, Pacific Northwest Region. 40 pp.
  • Henderson, J. A., D. A. Peter, R. Lesher, and D. C. Shaw. 1989. Forested plant associations of the Olympic National Forest. R6-ECOL-TP-001-88. USDA Forest Service, Pacific Northwest Region, Portland, OR. 502 pp.
  • Henderson, J. A., D. A. Peter, R. Lesher, and D. C. Shaw. 1992. Field guide to forested plant associations of the Mt. Baker-Snoqualmie National Forest. Technical Paper R6-ECOL-TP-028-91. USDA Forest Service, Pacific Northwest Region, Portland, OR. 196 pp.
  • Henderson, J. A., D. A. Peter, and R. Lesher. 1986. Preliminary plant associations of the Olympic National Forest. USDA Forest Service, Pacific Northwest Region. 136 pp.
  • Henderson, J. A., and D. Peter. 1981. Preliminary plant associations and habitat types of the Green and Cedar River drainages. North Bend District, Mt. Baker-Snoqualmie National Forest. Unpublished report prepared for USDA Forest Service. 48 pp.
  • Henderson, J. A., and D. Peter. 1982. Preliminary plant associations and habitat types of the Snoqualmie and adjacent Skykomish River drainages, Mt. Baker-Snoqualmie National Forest. Unpublished report prepared for USDA Forest Service, Pacific Northwest Region. 87 pp.
  • Henderson, J. A., and D. Peter. 1983. Preliminary plant associations and habitat types of the Skykomish Ranger District, Mt. Baker-Snoqualmie National Forest. Unpublished report prepared for USDA Forest Service, Pacific Northwest Region. 67 pp.
  • Henderson, J. A., and D. Peter. 1984. Preliminary plant associations and habitat types of the Darrington Ranger District, Mt. Baker-Snoqualmie National Forest. USDA Forest Service, Pacific Northwest Region. 69 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.
  • Klinka, K., H. Qian, J. Pojar, and D. V. Meidinger. 1996. Classification of natural forest communities of coastal British Columbia. Vegetatio 125:149-168.
  • McCain, C., and N. M. Diaz. 2002a. Field guide to the forested plant associations of the northern Oregon Coast Range. Siuslaw National Forest, USFS; Salem District, BLM; Eugene District, BLM. Technical Paper R6-NR-ECOL-TP-03-02. USDA Forest Service, Pacific Northwest Region, Portland, OR. 250 pp.
  • McCain, C., and N. M. Diaz. 2002b. Field guide to the forested plant associations of the westside central Cascades of northwest Oregon. Willamette N.F., USFS; Mt. Hood N.F., USFS; Salem District, BLM; Eugene District, BLM. Technical Paper R6-NR-ECOL-TP-02-02. USDA Forest Service, Pacific Northwest Region, Portland, OR.
  • Meidinger, D., C. Chappell, C. Cadrin, G. Kittel, C. McCain, K. Boggs, J. Kagan, G. Cushon, A. Banner, and T. DeMeo. 2005. International Vegetation Classification of the Pacific Northwest: International correlation of temperate coastal forest plant associations of Oregon, Washington, British Columbia and Alaska. Contributors: B.C. Ministry of Forests, USDA Forest Service, B.C. Conservation Data Centre, Alaska Natural Heritage Program, Washington Natural Heritage Program, and Oregon Natural Heritage Information Center.
  • Topik, C., N. M. Halverson, and D. G. Brockway. 1986. Plant associations and management guide for the western hemlock zone. R6-ECOL-230a-1986. USDA Forest Service, Gifford Pinchot National Forest, Pacific Northwest Region, Portland, OR. 137 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.
  • Williams, C. K., and B. G. Smith. 1990. Forested plant associations of the Wenatchee National Forest. Unpublished draft prepared by the USDA Forest Service, Pacific Northwest Region, Portland, OR. 217 pp.