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CEGL000930 Quercus garryana / Ceanothus cuneatus / Festuca idahoensis Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Oregon White Oak / Buckbrush / Idaho Fescue Woodland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This is an open woodland association, characterized by a canopy of broad-leaved deciduous trees over a dense shrub layer of broad-leaved evergreen, sclerophyllous shrubs. Quercus garryana is the most common, and usually the only, tree present, although Quercus kelloggii does occur in more mesic microsites. The 1- to 2-m tall shrub Ceanothus cuneatus strongly dominates the shrub layer. Other sclerophyllous shrubs that may be present or common include Arctostaphylos viscida, Toxicodendron diversilobum, Cercocarpus montanus var. glaber, Garrya fremontii, Frangula californica ssp. occidentalis, and Eriodictyon californicum. The herbaceous layer is dominated by perennial bunchgrasses, the most important and characteristic being Festuca idahoensis. This association occurs in the foothills, on the edges of the interior valleys, of the Siskiyou Mountain region. The major valleys, those of the Rogue and Umpqua rivers, are the warmest and driest regions west of the Cascades in Oregon, due to the strong rainshadow effect of the Coast Ranges and Siskiyous. This region is characterized by Mediterranean climatic features, with a relatively low total annual precipitation (roughly 40-70 cm), a period of summer drought, and moderate differences between seasonal temperature extremes. Summers are hot and dry, while winters are mild and wet. It is found on slopes of all aspects except northerly, between about 330 and 1000 m elevation. Sites are typically foothill slopes just above the valley floors. Soils are likely to be moderately deep. Ceanothus cuneatus is dominant on the most xeric of sites in the interior valleys, while Quercus garryana requires somewhat more mesic conditions.
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 is an open woodland association, characterized by a canopy of broad-leaved deciduous trees over a dense shrub layer of broad-leaved evergreen, sclerophyllous shrubs. Quercus garryana is the most common, and usually the only, tree present, although Quercus kelloggii does occur in more mesic microsites. The 1- to 2-m tall shrub Ceanothus cuneatus strongly dominates the shrub layer. Other sclerophyllous shrubs that may be present or common include Arctostaphylos viscida, Toxicodendron diversilobum, Cercocarpus montanus var. glaber (= Cercocarpus betuloides), Garrya fremontii, Frangula californica ssp. occidentalis, and Eriodictyon californicum. The herbaceous layer is dominated by perennial bunchgrasses, the most important and characteristic being Festuca idahoensis. No other information on species composition or cover is available.
Dynamics: No Data Available
Environmental Description: This association occurs in the foothills, on the edges of the interior valleys, of the Siskiyou Mountain region. The major valleys, those of the Rogue and Umpqua rivers, are the warmest and driest regions west of the Cascades in Oregon, due to the strong rainshadow effect of the Coast Ranges and Siskiyous. This region is characterized by Mediterranean climatic features, with a relatively low total annual precipitation (roughly 40-70 cm), a period of summer drought, and moderate differences between seasonal temperature extremes. Summers are hot and dry, while winters are mild and wet.
Little detailed information is available for this association. It is found on slopes of all aspects except northerly, between about 330 and 1000 m elevation. Sites are typically foothill slopes just above the valley floors. Soils are likely to be moderately deep. Ceanothus cuneatus is dominant on the most xeric of sites in the interior valleys, while Quercus garryana requires somewhat more mesic conditions.
Little detailed information is available for this association. It is found on slopes of all aspects except northerly, between about 330 and 1000 m elevation. Sites are typically foothill slopes just above the valley floors. Soils are likely to be moderately deep. Ceanothus cuneatus is dominant on the most xeric of sites in the interior valleys, while Quercus garryana requires somewhat more mesic conditions.
Geographic Range: It is found in the interior valleys of southwestern Oregon, particularly the Rogue River valley, in Josephine and Jackson counties. Barbour and Major (1988) have reported a similar vegetation type in the Siskiyou Mountains of northern California, but no stand data are available to determine the similarity of these types.
Nations: US
States/Provinces: CA, OR
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.687031
Confidence Level: Low - Poorly Documented
Confidence Level Comments: No Data Available
Grank: G2
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 | CEGL000930 Oregon White Oak / Buckbrush / Idaho Fescue Woodland | CEGL000930 | 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: No Data Available
- Barbour, M. G., and J. Major, editors. 1988. Terrestrial vegetation of California: New expanded edition. California Native Plant Society, Special Publication 9, Sacramento. 1030 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.
- Detling, L. E. 1961. The chaparral formation of southwestern Oregon, with considerations of its postglacial history. Ecology 42:348-357.
- 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.
- ORNHP [Oregon Natural Heritage Program]. No date. Unpublished data files. Oregon Natural Heritage Program, The Nature Conservancy, Portland, OR.
- Riegel, G. M., B. G. Smith, and J. F. Franklin. 1992. Foothill oak woodlands of the interior valleys of southwestern Oregon. Northwest Science 66(2):66-76.
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.