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Larrea tridentata - Ambrosia dumosa / Pleuraphis rigida Desert Shrubland | NatureServe Biotics 2019
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Name: Larrea tridentata - Ambrosia dumosa / Pleuraphis rigida Desert Shrubland Reference: NatureServe Biotics 2019 Description: This association occurs at lower to upper elevations in the Colorado and Mojave deserts in Arizona, Nevada and California. Vegetation is characterized by an open to patchy shrub canopy (3-18% cover) codominated by <i>Larrea tridentata</i> and <i>Ambrosia dumosa</i> with an herbaceous layer dominated by perennial native grass <i>Pleuraphis rigida</i>. Other shrubs are often present, including <i>Cylindropuntia echinocarpa</i> and <i>Krameria grayi</i>. The herbaceous layer is typically sparse to moderate and characterized by dominance of <i>Pleuraphis rigida</i>. Associated grasses and forbs include <i>Pectis papposa</i> and exotic annuals <i>Bromus madritensis</i>. A biological soil crust is often present to abundant. Stands are found on a variety of slope positions in the uplands. It is primarily present on sandy fans and lower bajadas and occasionally at the edges of sandsheets and dunes. However, sites also include sandy alluvial deposits, washes, plains, toeslopes of hills and rocky highlands ranging from 93-1250 m elevation. Sites are primarily flat to gently sloping or undulating, but include steep slopes on various aspects. Soils are typically sandy and rarely finer-textured soils and are derived from a variety of substrates, especially as alluvium and eolian sand, but include a variety of other parent materials. Stands typically experience low to high levels of disturbance from competition from exotic species (0-35%) and low levels of disturbance.  Accession Code: urn:lsid:vegbank.org:commConcept:34437-{41ADA136-37F4-47CA-81BB-266E876AC3FA} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 28-Nov-2016 to: ongoing
	status: accepted Community's Parent: Larrea tridentata - Ambrosia dumosa Bajada & Valley Desert Scrub Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.971728 NatureServe Explorer   Code: CEGL005764   Translated: Creosotebush - Burrobush / Big Galleta Desert Shrubland   Scientific: Larrea tridentata - Ambrosia dumosa / Pleuraphis rigida Desert Shrubland