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CEGL003175 Umbellularia californica - Quercus agrifolia / Toxicodendron diversilobum Forest
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: California Laurel - California Live Oak / Pacific Poison-oak Forest
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This association is only known from the vicinity of the Point Reyes National Seashore and Golden Gate National Recreation Area in California. Stands presumably of this association occur on neutral slope exposures on marine sediments and volcanic rocks in the East Bay Hills. Additional information about its global characteristics is not available without further inventory. This forest is characterized by codominance of Quercus agrifolia and Umbellularia californica, either of which can dominate any specific stand. Arbutus menziesii is often present at low cover values. Other trees such as Pseudotsuga menziesii, Pinus muricata, Notholithocarpus densiflorus, and/or Aesculus californica may also be present in small amounts. The tree canopy is continuous and usually between 10 and 20 m of height. Corylus cornuta is often the most common tall shrub, while Toxicodendron diversilobum dominates the shrub stratum between 1-2 m. Rubus parviflorus, Polystichum munitum, Heteromeles arbutifolia, and Baccharis pilularis may also occur in the shrub layer. The herbaceous layer is diverse and may be intermittent to continuous. Typical herbaceous species include Polystichum munitum, Clinopodium douglasii, Stachys ajugoides, Pteridium aquilinum, and/or Athyrium filix-femina. This association is more xeric than ~Umbellularia californica / Polystichum munitum Forest (CEGL003174)$$.
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 forest is characterized by codominance of Quercus agrifolia and Umbellularia californica, either of which can dominate any specific stand. Arbutus menziesii is often present at low cover values. Other trees such as Pseudotsuga menziesii, Pinus muricata, Notholithocarpus densiflorus (= Lithocarpus densiflorus), and/or Aesculus californica may also be present in small amounts. The tree canopy is continuous and usually between 10 and 20 m of height. Corylus cornuta is often the most common tall shrub, while Toxicodendron diversilobum dominates the shrub stratum between 1-2 m. Rubus parviflorus, Polystichum munitum, Heteromeles arbutifolia, and Baccharis pilularis may also occur in the shrub layer. The herbaceous layer is diverse and may be intermittent to continuous. Typical herbaceous species include Polystichum munitum, Clinopodium douglasii, Stachys ajugoides, Pteridium aquilinum, and/or Athyrium filix-femina.
This association is similar to the local Point Reyes description where it has been observed in the East Bay Hills. Quercus agrifolia and Umbellularia californica cover is variable, both species comprising at least 25% of the relative cover of trees. Arbutus menziesii is in most stands, but is usually substantially less cover than the other two trees.
This association is similar to the local Point Reyes description where it has been observed in the East Bay Hills. Quercus agrifolia and Umbellularia californica cover is variable, both species comprising at least 25% of the relative cover of trees. Arbutus menziesii is in most stands, but is usually substantially less cover than the other two trees.
Dynamics: No Data Available
Environmental Description: This association is only known from the vicinity of the Point Reyes National Seashore and Golden Gate National Recreation Area. Stands presumably of this association occur on neutral slope exposures on marine sediments and volcanic rocks in the East Bay Hills. Additional information about its global characteristics is not available without inventory. Compared to ~Umbellularia californica / Polystichum munitum Forest (CEGL003174)$$, this association is the more xeric.
Geographic Range: This association is known from the vicinity of the San Francisco Bay Area. It is also common in the East Bay Hills of Alameda and Contra Costa counties (Keeler-Wolf pers. obs. 1998-2000). Upon further investigation, it may be found to be more widespread to the south and north in the California Coast Ranges.
Nations: US
States/Provinces: CA
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.689641
Confidence Level: Low
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 | CEGL003175 California Laurel - California Live Oak / Pacific Poison-oak Forest | CEGL003175 | 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: = Umbellularia californica - Quercus agrifolia / Toxicodendron diversilobum (Corylus cornuta) (Sawyer et al. 2009) [74.100.05]
= Umbellularia californica - Quercus agrifolia / Toxicodendron diversilobum (Corylus cornuta) Association (Schirokauer et al. 2003) [pi code 01014]
= Umbellularia californica - Quercus agrifolia / Toxicodendron diversilobum (Corylus cornuta) Association (Schirokauer et al. 2003) [pi code 01014]
- 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.