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Quercus garryana / Festuca (idahoensis ssp. roemeri, rubra) Wooded Grassland | NatureServe Biotics 2019
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Name: Quercus garryana / Festuca (idahoensis ssp. roemeri, rubra) Wooded Grassland
Reference: NatureServe Biotics 2019
Description: This association is known from a few remaining sites in the Puget Lowland and Willamette Valley in western Washington and Oregon, the eastern slope of the Washington Cascades on the Yakima Indian Reservation, the Columbia River Gorge in Washington, and northwestern California. This association occurs at the lowermost boundary of woodland and forest vegetation, on hot, dry sites. It is found at low elevations, particularly in the Columbia River Gorge, on southerly aspects. Annual precipitation is relatively low, and there is a distinct summer dry season. Soils are moderately deep, rocky silt loams to loams, derived from mixed colluvium of basaltic materials with a minor component of loess. Vegetation characteristic of this association is dominated by the perennial grasses <i>Festuca idahoensis ssp. roemeri</i> or <i>Festuca rubra</i> with a sparse tree layer of <i>Quercus garryana</i> (10-30% canopy cover). The open woody canopy may have dense clumps because of the clonal nature of the species. Other tree species may include occasional <i>Pinus ponderosa</i> individuals. An open short-shrub layer of <i>Purshia tridentata</i> is present in some stands. Grazing by livestock and fire suppression have favored woody species over grasses and brought in introduced species. No other information is available on species cover except that introduced herbaceous species, such as <i>Bromus tectorum, Cynosurus</i> spp., <i>Poa bulbosa</i>, and <i>Ventenata dubia</i>, are common in disturbed stands. Information on stands in California was not available. Diagnostic of this association is a <i>Festuca idahoensis ssp. roemeri</i>- or <i>Festuca rubra</i>-dominated grassland with a very open tree layer dominated by <i>Quercus garryana</i>. 
Accession Code: urn:lsid:vegbank.org:commConcept:30623-{B66CC160-38B2-49B8-AC0F-46596C40D7CD}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 08-Feb-1994 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.686303 NatureServe ExplorerNatureServe Explorer logo
  Code: CEGL001714
  Translated: Oregon White Oak / (Roemer's Fescue, Red Fescue) Wooded Grassland
  Common: Oregon White Oak Wooded Grassland
  Scientific: Quercus garryana / Festuca (idahoensis ssp. roemeri, rubra) Wooded Grassland
(convergence) and Synonyms:
(similar) Quercus garryana / Festuca (roemeri, rubra) Wooded Herbaceous Vegetation
(similar) Quercus garryana / Festuca (roemeri, rubra) Wooded Herbaceous Vegetation
(similar) CEGL001714