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CEGL005340 Prosopis velutina - Acacia greggii Wet Scrub

The U.S. National
Vegetation Classification
Type Concept Sentence:
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Common (Translated Scientific) Name: Velvet Mesquite - Catclaw Acacia Wet Scrub
Colloquial Name:
Hierarchy Level: Association
Type Concept: This riparian woodland is described from southern Arizona. Plot data from Buenos Aires National Wildlife Refuge indicate an elevational range of 970-1030 m (3200-3700 feet) where it is found on gentle slopes along drainages and in floodplains on valley floors. The alluvial soils are variable and range from sand to clay textures. The vegetation is characterized by a moderately dense to dense tree canopy codominated by Prosopis velutina and Acacia greggii. Scattered short shrubs may be present but are generally not dense enough to form strata. Common shrubs may include Baccharis emoryi, Baccharis sarothroides, Calliandra eriophylla, Celtis pallida, Lycium andersonii, Mimosa aculeaticarpa var. biuncifera (= Mimosa biuncifera), Mimosa dysocarpa, and Opuntia spinosior. The open to dense (20-80% cover) herbaceous layer is dominated by a mixture of grasses and forbs. The native annual forb Amaranthus palmeri may be present but does not codominate the herbaceous layer. Associated herbaceous species include Aristida ternipes, Boerhavia spp., Bouteloua aristidoides, Bouteloua curtipendula, Chloris virgata, Digitaria californica, Ipomoea hederacea, Kallstroemia grandiflora, Panicum hirticaule, Proboscidea parviflora, and Tidestromia lanuginosa. If present, Eragrostis lehmanniana cover is low, with less than 25% cover and less than a third of the total perennial graminoid cover.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features:
Classification Comments: If a Prosopis velutina- and Acacia greggii-codominated stand has an understory dominated by Amaranthus palmeri or Sorghum halepense, it should be classified by the understory dominance.
Similar NVC Types:
Physiognomy and Structure: No Data Available
Floristics: The vegetation is characterized by a moderately dense to dense tree canopy codominated by Prosopis velutina and Acacia greggii. Scattered short shrubs may be present but are generally not dense enough to form strata. Common shrubs may include Baccharis emoryi, Baccharis sarothroides, Calliandra eriophylla, Celtis pallida, Lycium andersonii, Mimosa aculeaticarpa var. biuncifera (= Mimosa biuncifera), Mimosa dysocarpa, and Opuntia spinosior. The open to dense (20-80% cover) herbaceous layer is dominated by a mixture of grasses and forbs. The native annual forb Amaranthus palmeri may be present but does not codominate the herbaceous layer. Associated herbaceous species include Aristida ternipes, Boerhavia spp., Bouteloua aristidoides, Bouteloua curtipendula, Chloris virgata, Digitaria californica, Ipomoea hederacea, Kallstroemia grandiflora, Panicum hirticaule, Proboscidea parviflora, and Tidestromia lanuginosa. If present, Eragrostis lehmanniana cover is low, with less than 25% cover and less than a third of the total perennial graminoid cover.
Dynamics: No Data Available
Environmental Description: This riparian woodland is described from southern Arizona. Plot data from Buenos Aires National Wildlife Refuge indicate an elevational range of 970-1030 m (3200-3700 feet) where it is found on gentle slopes along drainages and in floodplains on valley floors. The alluvial soils are variable and range from sand to clay textures.
Geographic Range: This shrubland is found on foothills of Buenos Aires National Wildlife Refuge in southern Arizona and likely occurs in Texas and northern Mexico.
Nations: MX, US
States/Provinces: AZ, MXCH, MXCO, MXSO, NM, TX
US Forest Service Ecoregions (1994/1995)
Domain Name:
Division Name:
Province Name: Chihuahuan Semi-Desert Province
Province Code: 321    Occurrence Status: Confident or certain
Section Name: Basin and Range Section
Section Code: 321A     Occurrence Status: Confident or certain
Omernik Ecoregions:
Confidence Level: Low - Poorly Documented
Confidence Level Comments:
Grank: GNR
Greasons:
Concept Lineage:
Predecessors:
Obsolete Names:
Obsolete Parents:
Synonomy: = Prosopis velutina - Acacia greggii Woodland (Schulz 2004)
< Prosopis velutina / Parkinsonia floridum / Acacia greggii - Lycium Association (Malusa 2003)
Concept Author(s): K.A. Schulz
Author of Description: K.A. Schulz
Acknowledgements:
Version Date: 21Aug2007
References:
  • Malusa, J. 2003. Vegetation of the Cabeza Prieta National Wildlife Refuge, Arizona. Report submitted to Organ Pipe Cactus National Monument, NPS Cooperative Agreement CA1248.00.002. TA. UA2-71, NPS Cooperative Agreement 1443CA860197006. USGS Southwest Biological Science Center, Sonoran Desert Field Station, University of Arizona, Tucson.
  • Schulz, K. A. 2004. Vegetation classification of Buenos Aires National Wildlife Refuge, Arizona. Unpublished report submitted to USDI Fish and Wildlife Service. NatureServe, Western Regional Office, Boulder, CO.
  • Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.