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CEGL000086 Pseudotsuga menziesii - (Tsuga heterophylla) / Rhododendron macrophyllum Forest
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Douglas-fir - (Western Hemlock) / Pacific Rhododendron Forest
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This association is restricted to the southern Oregon Cascades. Pseudotsuga menziesii and Calocedrus decurrens dominate the canopy. Abies grandis and Pinus lambertiana are often present. The regeneration layer usually consists of Pseudotsuga menziesii, Calocedrus decurrens, and Abies grandis. Traces of Tsuga heterophylla are present in about half of the stands of this association, in both the canopy and regeneration layers. Rhododendron macrophyllum, Gaultheria shallon, and Mahonia nervosa dominate the shrub layer. Small amounts of Holodiscus discolor and Whipplea modesta may be present. Herbs are often sparse, but traces of some species, especially Linnaea borealis, Goodyera oblongifolia, Galium triflorum, Viola sempervirens, Pteridium aquilinum and Synthyris reniformis, occur. This association is often found in depressions, swales or on east- or west-facing slopes. However, most sites are too droughty for abundant Tsuga heterophylla establishment. Most stands are below 915 m (3000 feet) and on gentle to moderately steep slopes. Soils are usually moderately deep and stony.
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 and Calocedrus decurrens dominate the canopy. Abies grandis and Pinus lambertiana are often present. The regeneration layer usually consists of Pseudotsuga menziesii, Calocedrus decurrens, and Abies grandis. Traces of Tsuga heterophylla are present in about half of the stands of this association, in both the canopy and regeneration layers. Rhododendron macrophyllum, Gaultheria shallon, and Mahonia nervosa (= Berberis nervosa) dominate the shrub layer. Small amounts of Holodiscus discolor and Whipplea modesta may be present. Herbs are often sparse, but traces of some species, especially Linnaea borealis, Goodyera oblongifolia, Galium triflorum, Viola sempervirens, Pteridium aquilinum and Synthyris reniformis, occur.
Dynamics: No Data Available
Environmental Description: This association is often found in depressions, swales or on east- or west-facing slopes. However, most sites are too droughty for abundant Tsuga heterophylla establishment. Most stands are below 915 m (3000 feet) and on gentle to moderately steep slopes. Soils are usually moderately deep and stony.
Geographic Range: This association is restricted to the southern Oregon Cascades. It is restricted to relatively droughty, lower elevation, moderate east- and west-facing slopes. Because of these abiotic restrictions this association was apparently never a very common forest type.
Nations: US
States/Provinces: OR
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.687612
Confidence Level: Moderate
Confidence Level Comments: No Data Available
Grank: G3
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 | CEGL000086 Douglas-fir - (Western Hemlock) / Pacific Rhododendron Forest | CEGL000086 | 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: No Data Available
- Atzet, T., and D. L. Wheeler. 1984. Preliminary plant associations of the Siskiyou Mountains Province, Siskiyou National Forest. USDA Forest Service, Pacific Northwest Region, Portland, OR.
- 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.
- 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., 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.