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CEGL000097 Tsuga heterophylla / Mahonia nervosa / Linnaea borealis Forest
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Western Hemlock / Cascade Barberry / Twinflower Forest
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This association is restricted to the southwestern Oregon Cascades. Tree canopy cover is dominated by Pseudotsuga menziesii and Tsuga heterophylla. At most sites the understory tree canopy includes Tsuga heterophylla, Taxus brevifolia, and Abies lowiana. Common shrubs are Acer circinatum, Mahonia nervosa, Chimaphila umbellata, and Rubus ursinus. Typical herbs are Linnaea borealis, Trillium ovatum, and Goodyera oblongifolia. This association occurs at an average of 1045 m (3431 feet) elevation on northerly aspects with mean slope of 29%. Parent materials are typically basalt, andesite, pumice, ash, granite, or mixed intrusives with deep surface soils.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: This association was identified by Atzet and McCrimmon (1990), but was eliminated and split into seven alternate associations in the more recent work in southwestern Oregon (Atzet et al. 1996). This association likely also occurs in northern California.
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: Tree canopy cover is dominated by Pseudotsuga menziesii (36%) and Tsuga heterophylla (20%). At most sites the understory tree canopy includes Tsuga heterophylla (39%), Taxus brevifolia (14%), and Abies lowiana (= Abies concolor var. lowiana) (16%). Common shrubs are Acer circinatum (39%), Mahonia nervosa (= var. nervosa) (16%), Chimaphila umbellata (3%), and Rubus ursinus (2%). Typical herbs are Linnaea borealis (10%), Trillium ovatum (1%), and Goodyera oblongifolia (1%).
Dynamics: No Data Available
Environmental Description: This association occurs at an average of 1045 m (3431 feet) elevation on northerly aspects with mean slope of 29%. Parent materials are typically basalt, andesite, pumice, ash, granite, or mixed intrusives with deep surface soils.
Geographic Range: This association is restricted to the southwestern Oregon Cascades.
Nations: US
States/Provinces: CA?, OR
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.683557
Confidence Level: Moderate
Confidence Level Comments: No Data Available
Grank: G3Q
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 | A3379 Western Hemlock - Douglas-fir / Oceanspray Dry Forest Alliance | A3379 | 1.B.2.Nd.3.c |
| Association | CEGL000097 Western Hemlock / Cascade Barberry / Twinflower Forest | CEGL000097 | 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: = Tsuga heterophylla / Mahonia nervosa / Linnaea borealis Forest (Atzet and McCrimmon 1990)
- Atzet, T. A., D. E. White, L. A. McCrimmon, P. A. Martinez, P. R. Fong, and V. D. Randall. 1996. Field guide to the forested plant associations of southwestern Oregon. Technical Paper R6-NR-ECOL-TP-17-96. USDA Forest Service, Pacific Northwest Region, Portland, OR.
- Atzet, T., and L. A. McCrimmon. 1990. Preliminary plant associations of the southern Oregon Cascade Mountain Province. USDA Forest Service, Pacific Northwest Region, Siskiyou National Forest, Grants Pass, OR. 330 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.
- Dyrness, C. T., J. F. Franklin, and W. H. Moir. 1974a. A preliminary classification of forest communities in the central portion of the western Cascades of Oregon. Coniferous Forest Biome Bulletin 4:1-123.
- 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.
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.