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Quercus garryana / Viburnum ellipticum - Toxicodendron diversilobum Woodland | NatureServe Biotics 2019
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Name: Quercus garryana / Viburnum ellipticum - Toxicodendron diversilobum Woodland
Reference: NatureServe Biotics 2019
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. 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 <i>Quercus garryana</i> and frequently has significant amounts of the evergreen conifer <i>Pseudotsuga menziesii</i> 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 &lt;0.5 m tall and the tallest typically about 3 m tall. The typical codominant shrubs are <i>Viburnum ellipticum, Toxicodendron diversilobum</i> (a woody vine), <i>Symphoricarpos albus</i>, and <i>Holodiscus discolor</i>, with somewhat less <i>Amelanchier alnifolia</i> and <i>Oemleria cerasiformis</i>, and <i>Mahonia aquifolium, Rubus ursinus</i>, and <i>Rosa gymnocarpa</i> usually present in small amounts. Herbaceous species usually present include the grass <i>Melica subulata</i>, the forbs <i>Galium aparine, Lathyrus nevadensis, Moehringia macrophylla, Fragaria vesca, Clinopodium douglasii, Claytonia perfoliata, Nemophila parviflora</i>, and the ferns <i>Polystichum munitum, Polypodium glycyrrhiza</i>, and <i>Dryopteris arguta</i>. This association is distinguished from similar ones by &gt;10% combined cover of <i>Viburnum ellipticum</i> and <i>Toxicodendron diversilobum</i>, and each being present; along with &lt;25% cover of <i>Pseudotsuga menziesii</i>. 
Accession Code: urn:lsid:vegbank.org:commConcept:32236-{4A0D9AD0-BAA1-423D-9BE7-FD194BEBF625}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 01-Feb-2001 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.689592 NatureServe ExplorerNatureServe Explorer logo
  Code: CEGL003354
  Translated: Oregon White Oak / Western Blackhaw - Pacific Poison-oak Woodland
  Scientific: Quercus garryana / Viburnum ellipticum - Toxicodendron diversilobum Woodland
(convergence) and Synonyms:
(similar) CEGL003354
(similar) Quercus garryana / Viburnum ellipticum - Toxicodendron diversilobum Woodland
(similar) Quercus garryana / Viburnum ellipticum - Toxicodendron diversilobum Woodland