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CEGL005137 Larrea tridentata - Ambrosia dumosa - Krameria (erecta, grayi) Shrubland

The U.S. National
Vegetation Classification
Type Concept Sentence:
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Common (Translated Scientific) Name: Creosotebush - Burrobush - (Littleleaf Ratany, White Ratany) Shrubland
Colloquial Name:
Hierarchy Level: Association
Type Concept: This creosotebush shrubland association occurs in Arizona, California and Nevada. It is currently described from Grand Canyon National Park and Grand Canyon-Parashant National Monument in Arizona. More survey and classification work are needed to fully characterize this type. It occurs on a variety of landforms including sideslopes, drainage bottoms, and ridges at 375 to 625 m (1250-2075 feet) elevation, but can be found as high as 875 m (2850 feet). It is typically found on low gradients (1-5°), but occasionally occurs on steeper slopes (10-30°). The community seems to occur across all aspects besides west-facing, and seems to occur in various soil types. Vegetation is characterized by the codominance of three species: the tall shrub Larrea tridentata, the short shrub Krameria grayi, and the dwarf-shrub Ambrosia dumosa. The short-shrub layer also frequently supports the cactus Opuntia acanthocarpa and occasionally Krameria erecta. Opuntia basilaris is the only other dwarf-shrub that occurs regularly. Bromus rubens (exotic) and Vulpia octoflora are common in the sparse graminoid understory. Plantago ovata, Antheropeas lanosum, and Erodium cicutarium (exotic) are common members of the very sparse forb stratum.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features:
Classification Comments: No Data Available
Similar NVC Types:
Larrea tridentata - Ambrosia dumosa Shrubland, note: is also codominated by Larrea tridentata and Ambrosia dumosa and also supports Krameria spp., but they occur much less frequently and with much lower cover.
Yucca schidigera - Larrea tridentata - Ambrosia dumosa Shrubland, note:
Physiognomy and Structure: No Data Available
Floristics:
Dynamics: No Data Available
Environmental Description: No Data Available
Geographic Range: This Mojave Desert shrubland association occurs in northern Arizona, southeastern California and southern Nevada. More survey work is needed to fully document its global range.
Nations: US
States/Provinces: AZ, CA, NV
US Forest Service Ecoregions (1994/1995)
Domain Name:
Division Name:
Province Name: Colorado Plateau Semi-Desert Province
Province Code: 313    Occurrence Status: Confident or certain
Section Name: Mojave Desert Section
Section Code: 322A     Occurrence Status: Confident or certain
Omernik Ecoregions:
Confidence Level: Low
Confidence Level Comments:
Grank: GNR
Greasons:
Concept Lineage:
Predecessors:
Obsolete Names:
Obsolete Parents:
Synonomy: = Larrea tridentata - Ambrosia dumosa - Krameria (erecta, grayi) Shrubland (Reid and Hall 2010)
= Larrea tridentata - Ambrosia dumosa - Krameria erecta (Sawyer et al. 2009) [33.140.23]
> Larrea tridentata - Ambrosia dumosa - Krameria erecta Shrubland (Keeler-Wolf and Thomas 2000)
= Larrea tridentata - Ambrosia dumosa - Krameria grayi Association (Evens et al. 2012)
> Larrea tridentata - Ambrosia dumosa - Krameria grayi Shrubland (Keeler-Wolf and Thomas 2000)
> Larrea tridentata - Ambrosia dumosa - Krameria grayi Shrubland (Keeler-Wolf et al. 2005)
>< Larrea tridentata / Ambrosia deltoidea - Krameria grayii Association (Malusa 2003)
= Larrea tridentata-Ambrosia dumosa-Krameria (erecta, grayi) Association (Evens et al. 2014)
Concept Author(s): M.S. Reid and M.E. Hall (2010)
Author of Description: R. Meszaros
Acknowledgements:
Version Date: 06Jan2017
References:
  • Evens, J. M., D. Roach-McIntosh, and D. Stout. 2012. Vegetation descriptions for Joshua Tree National Park. Unpublished report submitted to USDI, National Park Service, Mojave Desert Inventory and Monitoring Network. California Native Plant Society, Sacramento, CA.
  • Evens, J. M., K. Sikes, D. Hastings, and J. Ratchford. 2014. Vegetation alliance descriptions for Lake Mead National Recreation Area, Death Valley National Park and Mojave National Preserve. Unpublished report submitted to USDI National Park Service, Mojave Desert Network Inventory and Monitoring Program. California Native Plant Society, Sacramento, CA. [http://science.nature.nps.gov/im/units/MOJN/rpts_pubs/rpts_pubs_main.cfm]
  • Kearsley, M. J. C., K. Green, M. Tukman, M. Reid, M. Hall, T. J. Ayers, and K. Christie. 2015. Grand Canyon National Park-Grand Canyon / Parashant National Monument vegetation classification and mapping project. Natural Resource Report NPS/GRCA/NRR--2015/913. National Park Service, Fort Collins, CO. 75 pp. plus appendices.
  • Keeler-Wolf, T., and K. Thomas. 2000. Draft descriptions of vegetation alliances for the Mojave Ecosystem Mapping project. California Natural Diversity Database, California Department of Fish and Game, Sacramento.
  • Keeler-Wolf, T., S. San, and D. Hickson. 2005. Vegetation classification of Joshua Tree National Park, Riverside and San Bernardino counties, California. Unpublished report to the National Park Service. California Fish and Game and California Native Plant Society, Sacramento, CA.
  • Malusa, J. 2003. Vegetation of the Cabeza Prieta National Wildlife Refuge, Arizona. Report submitted to Organ Pipe Cactus National Monument, NPS Cooperative Agreement CA1248.00.002. TA. UA2-71, NPS Cooperative Agreement 1443CA860197006. USGS Southwest Biological Science Center, Sonoran Desert Field Station, University of Arizona, Tucson.
  • Reid, M. S., and M. E. Hall. 2010. Vegetation classification of Grand Canyon National Park. Draft report submitted to 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.
  • Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.