Common (Translated Scientific) Name: Creosotebush - Burrobush - (Littleleaf Ratany, White Ratany) Shrubland
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:
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.
States/Provinces: AZ, CA, NV
|US Forest Service Ecoregions (1994/1995)|
Colorado Plateau Semi-Desert Province
Confident or certain
Mojave Desert Section
Confident or certain
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)