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Prosopis glandulosa - Prosopis velutina Warm Desert Ruderal Scrub Group | NatureServe Biotics 2019
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Name: Prosopis glandulosa - Prosopis velutina Warm Desert Ruderal Scrub Group
Reference: NatureServe Biotics 2019
Description: This broadly defined ruderal scrub group occurs in Arizona, New Mexico, western Texas, northern Mexico and elsewhere in the Desert Southwest. It includes upland desert scrub dominated by invasive native species (<i>Prosopis glandulosa</i> and <i>Prosopis velutina</i>) with &gt;95% relative cover and &gt;10% absolute shrub cover that has become widespread in the last century. However, <i>Prosopis</i> spp.-dominated stands that occur naturally (non-ruderal) in desert lowlands, drainages, washes and riparian areas (bosque) are excluded from this ruderal type. Also included in this ruderal group are stands dominated by exotic shrubs such as <i>Caesalpinia gilliesii</i>, as well as any disturbed desert scrub with an herbaceous layer strongly dominated by exotic species (&gt;90% relative cover), such that the former natural community cannot be determined. Characteristic understory species of the upland ruderal mesquite (<i>Prosopis</i> spp.) stands include native desert graminoids that were part of the former native upland vegetation invaded by mesquite. Many exotic species may dominate ruderal stands such as <i>Brassica nigra, Brassica tournefortii, Bromus madritensis, Bromus rubens, Centaurea</i> spp., <i>Cynodon dactylon, Eragrostis lehmanniana, Erodium cicutarium, Schismus arabicus, Schismus barbatus</i>, and <i>Sisymbrium altissimum</i>. Stands occur in southeastern Arizona on alluvial fans, ridges, hills and valley floors. The elevation range is 960-1100 m (3150-3600 feet). Climate is warm, semi-arid to arid continental. Mean annual precipitation ranges from 22-28 cm, but can vary greatly from year to year. Drought is not uncommon. Sites occur on gentle to moderate slopes. Substrates are variable but are often well-drained sandy loam. 
Accession Code: urn:lsid:vegbank.org:commConcept:40383-{2C619E21-23EB-4D3E-9A44-F49D901F8AAF}
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 06-Nov-2015 to: ongoing
      Names:   UID: ELEMENT_GLOBAL.2.953927 NatureServe ExplorerNatureServe Explorer logo
  Code: G819
  Scientific: Prosopis glandulosa - Prosopis velutina Warm Desert Ruderal Scrub Group