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CEGL000486 Thuja plicata - Tsuga heterophylla / Whipplea modesta Forest
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Western Red-cedar - Western Hemlock / Common Whipplea Forest
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This association is characteristically found on primarily eastern aspects, on the upper to middle third of the slope, and occasionally on the lower third. Parent material is commonly andesite or basalt and occasionally tephra that has been redeposited by wind and water. The environment is mild, evapotranspirational demand is low, summer temperatures are warm, not hot, and moisture stress is low. Soils are rarely frozen. Elevation ranges from 685 to 990 m (2250-3250 feet). Pseudotsuga menziesii is the dominant tree species, usually with about 50% canopy cover. Thuja plicata and Tsuga heterophylla are common in the overstory, but stands of this association may contain neither of these two species. Thuja plicata, Tsuga heterophylla, Pseudotsuga menziesii, and Acer macrophyllum are common in the regeneration layer. Abies concolor, Calocedrus decurrens, and Taxus brevifolia are also common in the understory. Acer circinatum, Whipplea modesta, Gaultheria shallon, and Rosa gymnocarpa are the dominant shrubs. Other common shrubs include Mahonia nervosa, Rubus ursinus, Symphoricarpos mollis, and Vaccinium virgatum. Common herbaceous species include Achlys triphylla, Anemone deltoidea, Prosartes hookeri, Goodyera oblongifolia, Linnaea borealis, and Trillium ovatum, usually at low cover.
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: Pseudotsuga menziesii is the dominant tree species, usually with about 50% canopy cover. Thuja plicata and Tsuga heterophylla are common in the overstory, but stands of this association may contain neither of these two species. Thuja plicata, Tsuga heterophylla, Pseudotsuga menziesii, and Acer macrophyllum are common in the regeneration layer. Abies concolor, Calocedrus decurrens, and Taxus brevifolia are also common in the understory. Acer circinatum, Whipplea modesta, Gaultheria shallon, and Rosa gymnocarpa are the dominant shrubs. Other common shrubs include Mahonia nervosa (= Berberis nervosa), Rubus ursinus, Symphoricarpos mollis, and Vaccinium virgatum (= Vaccinium parviflorum). Common herbaceous species include Achlys triphylla, Anemone deltoidea, Prosartes hookeri (= Disporum hookeri), Goodyera oblongifolia, Linnaea borealis, and Trillium ovatum, usually at low cover.
Dynamics: No Data Available
Environmental Description: This association is characteristically found on primarily eastern aspects, on the upper to middle third of the slope, and occasionally on the lower third. Parent material is commonly andesite or basalt and occasionally tephra that has been redeposited by wind and water. The environment is mild, evapotranspirational demand is low, summer temperatures are warm, not hot, and moisture stress is low. Soils are rarely frozen. Elevation ranges from 685 to 990 m (2250-3250 feet).
Geographic Range: This association is restricted to the southern Oregon Cascades. It is restricted to moist easterly slopes. Although this association is restricted by large-scale abiotic factors it was formerly a fairly common forest type.
Nations: US
States/Provinces: CA?, OR
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.687346
Confidence Level: Low
Confidence Level Comments: No Data Available
Grank: G2G3
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.f Western Hemlock - Sitka Spruce North-Central Pacific Rainforest Group | G751 | 1.B.2.Nd.3.f |
| Alliance | A3609 Grand Fir - Sitka Spruce - Western Red-cedar Forest Alliance | A3609 | 1.B.2.Nd.3.f |
| Association | CEGL000486 Western Red-cedar - Western Hemlock / Common Whipplea Forest | CEGL000486 | 1.B.2.Nd.3.f |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: = Thuja plicata - Tsuga heterophylla / Whipplea modesta Forest (Atzet and McCrimmon 1990)
- 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.
- 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.