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CEGL000880 Pinus ponderosa - Quercus garryana / Arctostaphylos viscida / Festuca californica Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Ponderosa Pine - Oregon White Oak / Sticky Whiteleaf Manzanita / California Fescue Woodland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This is an open woodland or savanna with widely spaced Pinus ponderosa and Quercus garryana (and rarely Quercus kelloggii or Arbutus menziesii) trees. Patches of chaparral, dominated by Ceanothus cuneatus and occasionally Arctostaphylos viscida, occur in openings. Native grasses dominate undisturbed sites, with Danthonia californica found on areas with clay soils, northern slopes, or areas with some spring moisture. Achnatherum lemmonii, Festuca idahoensis, and Pseudoroegneria spicata all can be found in drier or better drained sites, while Festuca californica and Melica geyeri are the dominant species in the shade. Toxicodendron diversilobum is found as a shrub and vine throughout these areas. This woodland association requires periodic fire to maintain its woodland character at most sites. Without fire, these woodlands first become forests of oak and pine, and eventually support Douglas-fir forests. If fire is excluded for long enough, they become a closed canopy mix of young Ponderosa pine, white oak, black oak and decadent chaparral, which burns explosively if exposed to a wildfire. In areas which are heavily grazed, introduced annual grasses (Cynosurus echinatus, Taeniatherum caput-medusae, Bromus spp.) and noxious weeds (Centaurea solstitialis) replace the native grasses and forbs as understory dominants.
Most examples of this association are found on valley bottomlands, with alluvial or clay soils of volcanic origin. However, in southwestern Oregon and northwestern California, occasional examples can be found on alluvial deposits in serpentine areas.
Most examples of this association are found on valley bottomlands, with alluvial or clay soils of volcanic origin. However, in southwestern Oregon and northwestern California, occasional examples can be found on alluvial deposits in serpentine areas.
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 or savanna with widely spaced Pinus ponderosa and Quercus garryana (and rarely Quercus kelloggii or Arbutus menziesii) trees. Patches of chaparral, dominated by Ceanothus cuneatus and occasionally Arctostaphylos viscida, occur in openings. Native grasses dominate undisturbed sites, with Danthonia californica found on areas with clay soils, northern slopes, or areas with some spring moisture. Achnatherum lemmonii (= Stipa lemmonii), Festuca idahoensis, and Pseudoroegneria spicata all can be found in drier or better drained sites, while Festuca californica and Melica geyeri are the dominant species in the shade. Toxicodendron diversilobum is found as a shrub and vine throughout these areas.
Dynamics: This woodland association requires periodic fire to maintain its woodland character at most sites. Without fire, these woodlands first become forests of oak and pine, and eventually support Douglas-fir forests. If fire is excluded for long enough, they become a closed canopy mix of young Ponderosa pine, white oak, black oak and decadent chaparral, which burns explosively if exposed to a wildfire. In areas which are heavily grazed, introduced annual grasses (Cynosurus echinatus, Taeniatherum caput-medusae, Bromus spp.) and noxious weeds (Centaurea solstitialis) replace the native grasses and forbs as understory dominants.
Environmental Description: Most examples of this association are found on valley bottomlands, with alluvial or clay soils of volcanic origin. However, in southwestern Oregon and northwestern California, occasional examples can be found on alluvial deposits in serpentine areas.
Geographic Range: Known from low elevations in the Klamath Mountains ecoregion, with most sites found in the foothills surrounding or bottomlands of the Rogue River valley (which includes the Illinois River valley.)
Nations: US
States/Provinces: CA?, OR
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.689097
Confidence Level: Low - Poorly Documented
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 | CEGL000880 Ponderosa Pine - Oregon White Oak / Sticky Whiteleaf Manzanita / California Fescue Woodland | CEGL000880 | 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
- 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.
- 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.
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.