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Larrea tridentata - Ambrosia dumosa Shrubland Alliance | Western Ecology Working Group of...
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Name: Larrea tridentata - Ambrosia dumosa Shrubland Alliance Reference: Western Ecology Working Group of... Description: This widespread alliance occurs in the Mojave, Sonoran and Colorado deserts and extends into the southeastern Great Basin. Stands occur on alluvial fans, bajadas, upland slopes and minor washes. Sites are gentle to moderately sloping. Substrates are typically well-drained, sandy soils derived from colluvium or alluvium, and are often calcareous with a caliche hardpan and/or a pavement surface. The vegetation is characterized by an open, xeromorphic shrub layer codominated by Larrea tridentata and Ambrosia dumosa. Cover of either species does not exceed the other by more than twice, and no other species greatly exceeds the cover of both combined. Other desert shrubs and dwarf-shrubs may be present to codominant including Atriplex confertifolia, Atriplex hymenelytra, Ephedra funerea, Ephedra nevadensis, Hymenoclea salsola, Krameria grayi, Krameria erecta, Lycium andersonii, Opuntia ramosissima, Psorothamnus arborescens, Psorothamnus fremontii, Salazaria mexicana, Senna armata, and many others. If Encelia farinosa or Yucca schidigera is present, cover is low (<1-2% cover). Occasional emergent Fouquieria splendens or Yucca brevifolia and herbaceous species such as Croton californicus, Eriogonum inflatum, Echinocactus polycephalus, Galium angustifolium, or Pleuraphis rigida may also be present. Abundant annuals may be seasonally present. This vegetation is very common and dominates much of the desert landscapes in the southwestern U.S.  Accession Code: VB.CC.25353.LARREATRIDENTAT Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 16-Oct-2001 to: 01-May-2019
	status: accepted This Community's Level: Alliance This Community's Children: [none]		Names:   Scientific: Larrea tridentata - Ambrosia dumosa Shrubland Alliance   Translated: Creosotebush - White Burrobush Shrubland Alliance   UID: HIGHER_CLASS_UNIT.2.125709 NatureServe Explorer   Code: A.2532