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Ambrosia dumosa - Ephedra (aspera, nevadensis) Dwarf-shrubland | NatureServe Biotics 2019
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Name: Ambrosia dumosa - Ephedra (aspera, nevadensis) Dwarf-shrubland
Reference: NatureServe Biotics 2019
Description: This white bursage shrubland association 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 primarily on sideslopes and ridgetops at 650 to 750 m (2150-2500 feet) elevation, but may occur throughout a broader elevational range than was documented by the classification plots. It is typically found on moderately sloping gradients (10-15°), but has also been seen on nearly flat surfaces. Soils are well- to rapidly-drained sandy clays that occasionally obscure the bedrock below. The underlying geology is usually sandstone. Vegetation is characterized and codominated by the dwarf-shrub <i>Ambrosia dumosa</i> and the short shrub <i>Ephedra aspera</i>. In some stands, <i>Ephedra aspera</i> is absent and <i>Ephedra nevadensis</i> takes its place as a codominant. Tall shrubs are rare, but some stands are occasionally contain <i>Acacia greggii</i>. The short-shrub layer also frequently includes <i>Ferocactus cylindraceus</i>. The only other dwarf-shrub that appears with significant cover is <i>Gutierrezia sarothrae</i>. <i>Vulpia octoflora</i> and <i>Pleuraphis jamesii</i> are frequently present in a sparse graminoid layer. <i>Erodium cicutarium, Lepidium densiflorum</i>, and <i>Machaeranthera pinnatifida</i> occur with some regularity in a relatively poorly-developed forb layer. 
Accession Code: urn:lsid:vegbank.org:commConcept:29863-{D7DED9D4-C616-4D59-A8F7-B89CB4CFFBB7}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 29-Jul-2010 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.685705 NatureServe ExplorerNatureServe Explorer logo
  Code: CEGL000954
  Translated: Burrobush - (Rough Joint-fir, Nevada Joint-fir) Dwarf-shrubland
  Scientific: Ambrosia dumosa - Ephedra (aspera, nevadensis) Dwarf-shrubland
(convergence) and Synonyms:
(similar) CEGL000954
(similar) Ambrosia dumosa - Ephedra nevadensis Dwarf-shrubland
(similar) Ambrosia dumosa - Ephedra (fasciculata, nevadensis) Dwarf-shrubland