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CEGL003169 Quercus agrifolia / Toxicodendron diversilobum - (Corylus cornuta) Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: California Live Oak / Pacific Poison-oak - (Beaked Hazelnut) Woodland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This association is known from the vicinity of the San Francisco Bay Area and at Point Reyes National Seashore. It has been observed in Alameda, Contra Costa, Marin, and Santa Cruz counties. This association is a relatively xeric south-facing woodland or forest. Most stands in the East Bay Hills are on middle to upper thirds of slopes or on edges of grasslands on all slope positions. Most stands appear to be on marine sedimentary rocks in the East Bay Hills, but may occur on granitic substrates and on calcareous substrates in the Santa Cruz Mountains. These stands alternate between stands of ~Umbellularia californica - Quercus agrifolia / Toxicodendron diversilobum Forest (CEGL003175)$$ on more mesic, neutral (northwest or southeast to east) exposures in many drainages in the East Bay Municipal Utility District and East Bay Regional Park lands. Quercus agrifolia is the sole or dominant tree forming an intermittent to continuous canopy usually between 10 and 20 m in height. Umbellularia californica maybe present, in low cover. The shrub layer is open to intermittent. Toxicodendron diversilobum is an important species. Corylus cornuta is present in some stands. Other shrub associates may include Rubus ursinus, Frangula californica ssp. californica, Lonicera hispidula, Heracleum maximum, and/or Holcus lanatus. The herbaceous layer is open but diverse. Pteridium aquilinum, Clinopodium douglasii, Heteromeles arbutifolia, Stachys ajugoides, and/or Erechtites minimus are often present.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: A similar and possibly analogous association, the Quercus agrifolia / Toxicodendron diversilobum association, has been described throughout much of the central California Coast Ranges from Sonoma County to San Luis Obispo County by Allen et al. (1991).
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: Quercus agrifolia is the sole or dominant tree forming an intermittent to continuous canopy usually between 10 and 20 m in height. Umbellularia californica maybe present, in low cover. The shrub layer is open to intermittent. Toxicodendron diversilobum is an important species. Corylus cornuta is present in some stands. Other shrub associates may include Rubus ursinus, Frangula californica ssp. californica, Lonicera hispidula, Heracleum maximum, and/or Holcus lanatus. The herbaceous layer is open but diverse. Pteridium aquilinum, Clinopodium douglasii, Heteromeles arbutifolia, Stachys ajugoides, and/or Erechtites minimus are often present.
Dynamics: No Data Available
Environmental Description: This association is a relatively xeric south-facing woodland or forest. Most stands in the East Bay Hills are on middle to upper thirds of slopes or on edges of grasslands on all slope positions. Most stands appear to be on marine sedimentary rocks in the East Bay Hills, but may occur on granitic substrates and on calcareous substrates in the Santa Cruz Mountains. These stands alternate between stands of ~Umbellularia californica - Quercus agrifolia / Toxicodendron diversilobum Forest (CEGL003175)$$ on more mesic, neutral (northwest or southeast to east) exposures in many drainages in the East Bay Municipal Utility District and East Bay Regional Park lands.
Geographic Range: This association is known from the vicinity of the San Francisco Bay Area. It has been observed in Alameda, Contra Costa, Marin (including Point Reyes National Seashore), and Santa Cruz counties (Keeler-Wolf pers. obs.).
Nations: US
States/Provinces: CA
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.683650
Confidence Level: Low - Poorly Documented
Confidence Level Comments: No Data Available
Grank: G4
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.1 Warm Temperate Forest & Woodland Formation | F018 | 1.B.1 |
| Division | 1.B.1.Nc Californian Forest & Woodland Division | D007 | 1.B.1.Nc |
| Macrogroup | 1.B.1.Nc.1 California Live Oak - California Laurel - Western Cypress species Forest & Woodland Macrogroup | M009 | 1.B.1.Nc.1 |
| Group | 1.B.1.Nc.1.a California Live Oak - Valley Oak - California Laurel Forest & Woodland Group | G195 | 1.B.1.Nc.1.a |
| Alliance | A3346 California Live Oak Woodland Alliance | A3346 | 1.B.1.Nc.1.a |
| Association | CEGL003169 California Live Oak / Pacific Poison-oak - (Beaked Hazelnut) Woodland | CEGL003169 | 1.B.1.Nc.1.a |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: = Quercus agrifolia / Toxicodendron diversilobum - (Corylus cornuta) (Sawyer et al. 2009) [71.060.25]
= Quercus agrifolia / Toxicodendron diversilobum - (Corylus cornuta) Association (Schirokauer et al. 2003) [pi code 12022]
= Quercus agrifolia / Toxicodendron diversilobum association (Allen et al. 1991)
= Quercus agrifolia / Toxicodendron diversilobum - (Corylus cornuta) Association (Schirokauer et al. 2003) [pi code 12022]
= Quercus agrifolia / Toxicodendron diversilobum association (Allen et al. 1991)
- Allen, B. H., R. R. Everet, and B. A. Holzman. 1991. A classification system for California''s hardwood rangelands. Hilgardia 59:1-45.
- Keeler-Wolf, T. Personal communication. Senior Vegetation Ecologist, Wildlife and Habitat Data Analysis Branch, California Department of Fish and Game, Sacramento, CA.
- Sawyer, J. O., T. Keeler-Wolf, and J. Evens. 2009. A manual of California vegetation. Second edition. California Native Plant Society, Sacramento CA. 1300 pp.
- Schirokauer, D., T. Keeler-Wolf, J. Meinke, and P. van der Leeden. 2003. Plant community classification and mapping project. Point Reyes National Seashore, Golden Gate National Recreation Area, San Francisco Water Department Watershed Lands, Mount Tamalpais, Tomales Bay, and Samuel P. Taylor State Parks. Final report. California State Department of Fish and Game, Wildlife and Habitat Data Analysis Branch, Sacramento, National Park Service, Point Reyes Station, and Aerial Information Systems, Redlands, CA. 82 pp. [http://biology.usgs.gov/npsveg/pore_goga/index.html]
- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.