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CEGL001381 Prosopis glandulosa var. torreyana Wet Scrub

The U.S. National
Vegetation Classification
Type Concept Sentence:
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Common (Translated Scientific) Name: Western Honey Mesquite Wet Scrub
Colloquial Name:
Hierarchy Level: Association
Type Concept: This mesquite shrubland association is currently described from Grand Canyon National Park in Arizona. It is also reported from Nevada, California, Texas and possibly New Mexico. More survey and classification work are needed to fully characterize this type. It occurs most commonly along the Colorado River corridor above the old high-water line, but also in large tributary canyons along drainage channels and on adjacent sideslopes. It typically occurs at 375 to 850 m (1225-2825 feet) elevation, but has been observed at up to 1050 m (3475 feet). It occurs on gentle to moderate gradients (up to 20°), across all aspects other than south-facing. When found on sideslopes, it typically occurs on low slopes or toeslopes. Soils are well- to rapidly-drained sandy loams. Some stands support notable cryptogamic soil crust. This association is characterized by pure and fairly dense stands of tall-shrub or small-tree Prosopis glandulosa var. torreyana, which can reach 75% cover in dense stands. Encelia farinosa occasionally occurs in the short-shrub layer, while various other species, including Baccharis sarothroides, Pluchea sericea, Isocoma acradenia, Atriplex canescens, and Ephedra spp., occur less frequently. Dwarf-shrubs are essentially absent. Exotic Bromus rubens and the native annual Vulpia octoflora dominate the graminoid understory when it occurs, although it is not present in all stands. Forb composition is quite variable.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features:
Classification Comments: No Data Available
Similar NVC Types:
Physiognomy and Structure: No Data Available
Dynamics: No Data Available
Environmental Description: No Data Available
Geographic Range: This association is currently described from Grand Canyon National Park in Arizona. It is also reported from Nevada, California, Texas and possibly New Mexico. More survey work is needed to fully document its global range.
Nations: US
States/Provinces: AZ, CA, NM?, NV, TX
US Forest Service Ecoregions (1994/1995)
Domain Name:
Division Name:
Province Name: Intermountain Semi-Desert and Desert Province
Province Code: 341    Occurrence Status: Confident or certain
Section Name: Mojave Desert Section
Section Code: 322A     Occurrence Status: Confident or certain
Omernik Ecoregions:
Confidence Level: Low
Confidence Level Comments:
Grank: G3
Concept Lineage:
Obsolete Names:
Obsolete Parents:
Synonomy: = Prosopis glandulosa var. torreyana Association (Evens et al. 2014)
= Prosopis glandulosa (Bourgeron and Engelking 1994)
< DRISCOLL FORMATION CODE:III.C.2.b. (Driscoll et al. 1984)
Concept Author(s): Western Ecology Group
Author of Description: K. Christie
Version Date: 06Jan2017
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  • Bourgeron, P. S., and L. D. Engelking, editors. 1994. A preliminary vegetation classification of the western United States. Unpublished report. The Nature Conservancy, Western Heritage Task Force, Boulder, CO. 175 pp. plus appendix.
  • Driscoll, R. S., D. L. Merkel, D. L. Radloff, D. E. Snyder, and J. S. Hagihara. 1984. An ecological land classification framework for the United States. Miscellaneous Publication No. 1439. USDA Forest Service, Washington, DC. 56 pp.
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  • Keeler-Wolf, T., and K. Thomas. 2000. Draft descriptions of vegetation alliances for the Mojave Ecosystem Mapping project. California Natural Diversity Database, California Department of Fish and Game, Sacramento.
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  • Reid, M. S., and M. E. Hall. 2010. Vegetation classification of Grand Canyon National Park. Draft report submitted to National Park Service, Fort Collins, CO.
  • Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.