Common (Translated Scientific) Name: Burrobush Dwarf-shrubland
Hierarchy Level: Association
Type Concept: This white bursage shrubland association occurs in the Mojave Desert of California, as well as northwestern Arizona and southern 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 primarily occurs on sideslopes and plateaus at 475 to 575 m (1600 to 1875 feet) elevation; it rarely occurs as high as 625 m (2025 feet). This association is typically found on moderately sloping gradients (10-15°), but occasionally occurs on much flatter slopes (0-4°). Soils are rapidly-drained sands or sandy loams that lie on top of limestone or sandstone. Ambrosia dumosa dominates the dwarf-shrub layer and characterizes this vegetation type. Tall shrubs such as Larrea tridentata occasionally occur in a poorly-defined stratum. Opuntia acanthocarpa, Ephedra torreyana, and Encelia farinosa regularly occur in a sparse short-shrub layer. The cactus Opuntia basilaris is commonly found in the dwarf-shrub layer. Bromus rubens and Vulpia octoflora occur occasionally in the sparse graminoid layer. Eriogonum inflatum, Gilia sp., Cryptantha spp., Pectocarya sp., and Descurainia pinnata are common forbs.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features:
Classification Comments: No Data Available
Similar NVC Types:
Ambrosia dumosa - Encelia farinosa Dwarf-shrubland, note: is also dominated by Ambrosia dumosa, has a similar floristic composition, and is typically found on sideslopes, but Encelia farinosa occurs more frequently and with higher cover.
Geographic Range: This shrubland association is currently known from the Mojave Desert of California and Nevada, and Grand Canyon National Park and Grand Canyon-Parashant National Monument in Arizona. 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