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CEGL002878 Avena fatua Ruderal Grassland

Type Concept Sentence: This association is defined from the Santa Monica Mountains region but is likely to be extremely widespread throughout cismontane California. Avena fatua is characteristically abundant in the herbaceous layer, and Bromus diandrus and Brassica nigra are often present.

Common (Translated Scientific) Name: Wild Oat Ruderal Grassland

Colloquial Name: No Data Available

Hierarchy Level:  Association

Type Concept: This association is defined from the Santa Monica Mountains region. It is likely to be extremely widespread throughout cismontane California. This herbaceous association occurs on gentle to steep often northwest- or southwest-facing slopes at low elevations between 165 and 268 m. Avena fatua is characteristically abundant in the herbaceous layer, and Bromus diandrus and Brassica nigra are often present. Lotus scoparius, Baccharis pilularis, and Artemisia californica are sometimes found in the shrub layer at low cover, and Quercus agrifolia is infrequently in the tree layer at low cover.

Diagnostic Characteristics: No Data Available

Rationale for Nominal Species or Physiognomic Features: No Data Available

Classification Comments: A similar association has been identified in the central Coast Ranges: Avena barbata - Avena fatua association (Keeler-Wolf and Evens 2006).

Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available

Floristics: Stands of this association at Santa Monica Mountains National Recreation Area form an intermittent to continuous herbaceous layer (40-90%, mean 58.3%) at 0.01-1 m tall. The shrub layer is sparse to open (0-10%, mean 2.8%) at 0-2 m tall. Trees are infrequently emergent (0-0% cover, mean 0%) with hardwoods at 0-10 m tall. Total vegetation cover is 40-90%; mean cover is 61.1%. In this association, the herbaceous layer is intermittent to continuous and invasive exotic Avena fatua is characteristic. Bromus diandrus and Brassica nigra are often included in this layer. The shrub layer occasionally includes Lotus scoparius, Baccharis pilularis, and Artemisia californica. The tree infrequently layer includes Quercus agrifolia as an emergent.

Dynamics:  Until further inventory is completed, there is no global information.
Environmental Description:  Until further inventory is completed, there is no global information.
Geographic Range: This association is defined from the Santa Monica Mountains region. Information about its global distribution is not available without additional inventory. It is likely to be extremely widespread throughout cismontane California.

Nations: US

States/Provinces:  CA


Confidence Level: High

Confidence Level Comments: No Data Available
Grank: GNA

Greasons: No Data Available
Type Name Database Code Classification Code
Class 2 Shrub & Herb Vegetation Class C02 2
Subclass 2.B Temperate & Boreal Grassland & Shrubland Subclass S18 2.B
Formation 2.B.1 Mediterranean Scrub & Grassland Formation F038 2.B.1
Division 2.B.1.Na Californian Scrub & Grassland Division D327 2.B.1.Na
Macrogroup 2.B.1.Na.90 Wild Oat - Black Mustard - Ripgut Brome Ruderal Grassland, Meadow & Scrub Macrogroup M046 2.B.1.Na.90
Group 2.B.1.Na.90.a Wild Oat - Ripgut Brome Ruderal Grassland, Meadow & Scrub Group G497 2.B.1.Na.90.a
Alliance A3870 Wild Oat - Brome species Ruderal Annual Grassland Alliance A3870 2.B.1.Na.90.a
Association CEGL002878 Wild Oat Ruderal Grassland CEGL002878 2.B.1.Na.90.a
Concept Lineage: No Data Available

Predecessors: No Data Available

Obsolete Names: No Data Available

Obsolete Parents: No Data Available
Synonomy: = Avena barbata - Avena fatua Grassland Association (Evens and San 2004)
= Avena barbata - Avena fatua Semi-natural Association (Rodriguez et al. 2017)
= Avena fatua (Sawyer et al. 2009) [44.150.04]
= Avena fatua Herbaceous Association (Keeler-Wolf and Evens 2006)
= Avena fatua Stand Type (Buck-Diaz et al. 2012)
< Bromus (diandrus, hordeaceus, madritensis) Herbaceous Alliance (Reid et al. 1999)
< California Annual Grassland (Sawyer and Keeler-Wolf 1995)
< Non-native Grassland (#42200) (Holland 1986b)
Concept Author(s): T. Keeler-Wolf and J. Evens (2006)

Author of Description: T. Keeler-Wolf and J. Evens

Acknowledgements: No Data Available

Version Date: 11-10-05
  • Buck-Diaz, J., S. Batiuk, and J. M. Evens. 2012. Vegetation alliances and associations of the Great Valley ecoregion, California. California Native Society, Sacramento, CA. [http://cnps.org/cnps/vegetation/pdf/great_valley_eco-vegclass2012.pdf]
  • CNPS [California Native Plant Society]. 2015b. Inventory of Rare and Endangered Plants (online edition, v8-02). Rare Plant Program, California Native Plant Society, Sacramento, CA. [http://www.rareplants.cnps.org].
  • Evens, J., and S. San. 2004. Vegetation associations of a serpentine area: Coyote Ridge, Santa Clara County, California. Unpublished report. California Native Plant Society, Sacramento, CA.
  • Holland, R. F. 1986b. Preliminary descriptions of the terrestrial natural communities of California. Unpublished report prepared for the California Department of Fish and Game, Nongame-Heritage Program and Natural Diversity Database, Sacramento. 156 pp.
  • Keeler-Wolf, T., and J. Evens. 2006. Vegetation classification of the Santa Monica Mountains National Recreation Area and environs in Ventura and Los Angeles counties, California. A report submitted to National Park Service, Santa Monica Mountains National Recreation Area by California Department of Fish and Game, Wildlife and Habitat Data Analysis Branch and The California Native Plant Society, Vegetation Program, Sacramento, CA.
  • Parker, T. J. 1990. The vegetation of the Mount Tamalpais watershed of the Marin Municipal Water District and those on the adjacent lands of the Marin County Open Space District. Unpublished report. Department of Biology, San Francisco State University.
  • Reid, M. S., K. A. Schulz, P. J. Comer, M. H. Schindel, D. R. Culver, D. A. Sarr, and M. C. Damm. 1999. An alliance level classification of vegetation of the coterminous western United States. Unpublished final report to the University of Idaho Cooperative Fish and Wildlife Research Unit and National Gap Analysis Program, in fulfillment of Cooperative Agreement 1434-HQ-97-AG-01779. The Nature Conservancy, Western Conservation Science Department, Boulder, CO.
  • Rodriguez, D., K. G. Sikes, T. Keeler-Wolf, G. Kittel, J. Curtis, C. Curley, and J. Evens. 2017. Vegetation classification of Channel Islands National Park. Report to the National Park Service, Fort Collins, CO.
  • 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.
  • Sawyer, J. O., and T. Keeler-Wolf. 1995. A manual of California vegetation. California Native Plant Society, Sacramento. 471 pp.
  • Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.