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CEGL003354 Quercus garryana / Viburnum ellipticum - Toxicodendron diversilobum Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Oregon White Oak / Western Blackhaw - Pacific Poison-oak Woodland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This forest association occurs only at low elevations in a small area of southwestern Washington and adjacent Oregon, including the southern Puget Lowland and the northernmost Willamette Valley. Stands are primarily associated with basalt bedrock or talus on shallow, stony, or bouldery soils. These are dry sites that tend to be on southern or western aspect slopes. Periodic pre-European settlement fires probably helped maintain the dominance of oak over conifers on many sites. This deciduous broad-leaved forest or woodland is dominated by Quercus garryana and frequently has significant amounts of the evergreen conifer Pseudotsuga menziesii in the canopy or subcanopy (mean 11% cover when present). The species-rich understory is dominated by multiple layers of deciduous broad-leaved shrubs and woody vines, the shortest being <0.5 m tall and the tallest typically about 3 m tall. The typical codominant shrubs are Viburnum ellipticum, Toxicodendron diversilobum (a woody vine), Symphoricarpos albus, and Holodiscus discolor, with somewhat less Amelanchier alnifolia and Oemleria cerasiformis, and Mahonia aquifolium, Rubus ursinus, and Rosa gymnocarpa usually present in small amounts. Herbaceous species usually present include the grass Melica subulata, the forbs Galium aparine, Lathyrus nevadensis, Moehringia macrophylla, Fragaria vesca, Clinopodium douglasii, Claytonia perfoliata, Nemophila parviflora, and the ferns Polystichum munitum, Polypodium glycyrrhiza, and Dryopteris arguta. This association is distinguished from similar ones by >10% combined cover of Viburnum ellipticum and Toxicodendron diversilobum, and each being present; along with <25% cover of Pseudotsuga menziesii.
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: This deciduous broad-leaved forest or woodland is dominated by Quercus garryana and frequently has significant amounts of the evergreen conifer Pseudotsuga menziesii in the canopy or subcanopy (mean 11% cover when present). The species-rich understory is dominated by multiple layers of deciduous broad-leaved shrubs and woody vines, the shortest being <0.5 m tall and the tallest typically about 3 m tall. The typical codominant shrubs are Viburnum ellipticum, Toxicodendron diversilobum (a woody vine), Symphoricarpos albus, and Holodiscus discolor, with somewhat less Amelanchier alnifolia and Oemleria cerasiformis, and Mahonia aquifolium, Rubus ursinus, and Rosa gymnocarpa usually present in small amounts. Herbaceous species usually present include the grass Melica subulata, the forbs Galium aparine, Lathyrus nevadensis, Moehringia macrophylla, Fragaria vesca, Clinopodium douglasii (= Satureja douglasii), Claytonia perfoliata, Nemophila parviflora, and the ferns Polystichum munitum, Polypodium glycyrrhiza, and Dryopteris arguta.
Dynamics: Periodic pre-European settlement fires probably helped maintain the dominance of oak over conifers on many sites.
Environmental Description: This forest association occurs only at low elevations in a small area of southwestern Washington and adjacent Oregon, including the southern Puget Lowland and the northernmost Willamette Valley. Stands are primarily associated with basalt bedrock or talus on shallow, stony, or bouldery soils. These are dry sites that tend to be on southern or western aspect slopes.
Geographic Range: Almost all of this type occurs within 5 miles of the Columbia River in Washington between Cape Horn, Skamania County, and Kelso, Cowlitz County, including a portion of Clark County. The type also occurs just across the river from Washington on Sauvie Island in Oregon.
Nations: US
States/Provinces: OR, WA
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.689592
Confidence Level: Low
Confidence Level Comments: No Data Available
Grank: G1
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.1 Southern Vancouverian Dry Foothill Forest & Woodland Macrogroup | M886 | 1.B.2.Nd.1 |
| Group | 1.B.2.Nd.1.b Oregon White Oak - Ponderosa Pine - Douglas-fir Forest & Woodland Group | G206 | 1.B.2.Nd.1.b |
| Alliance | A3328 Oregon White Oak - Douglas-fir / Pacific Poison-oak Forest & Woodland Alliance | A3328 | 1.B.2.Nd.1.b |
| Association | CEGL003354 Oregon White Oak / Western Blackhaw - Pacific Poison-oak Woodland | CEGL003354 | 1.B.2.Nd.1.b |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: = Quercus garryana / Viburnum ellipticum - Toxicodendron diversilobum Woodland (Chappell et al. n.d.)
= Quercus garryana / Viburnum ellipticum / Toxicodendron diversilobum (Chappell 2006b) [14 plots]
= Quercus garryana / Viburnum ellipticum / Toxicodendron diversilobum (Chappell 2006b) [14 plots]
- 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]
- Chappell, C. B., R. Bigley, R. Crawford, and D. F. Giglio. No date. Field guide to terrestrial plant associations of the Puget Lowland, Washington. Washington Natural Heritage Program, Washington Department of Natural Resources, Olympia, WA. [in preparation]
- 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.