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CEGL005342 Prosopis velutina / Sorghum halepense Ruderal Wet Scrub

The U.S. National
Vegetation Classification
Type Concept Sentence:
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Common (Translated Scientific) Name: Velvet Mesquite / Johnson Grass Ruderal 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 960-1060 m (3150-3480 feet) and that stands are found on flats and gentle slopes along drainages and in floodplains on the valley floor. Soils are sandy loam. Sites are typically disturbed by past agricultural activities. The vegetation is characterized by a moderately dense to dense tree canopy dominated by Prosopis velutina with the exotic, perennial forage grass Sorghum halepense dominating a moderately dense to dense herbaceous layer. Acacia greggii may codominate the tree canopy; scattered short shrubs may also be present but are generally not dense enough to form strata. Common shrubs include Acacia greggii, Lycium spp., Condalia spathulata, Opuntia spinosior, and Ziziphus obtusifolia. The native annual forb Amaranthus palmeri often codominates the herbaceous layer. Other associated herbaceous species include Boerhavia coccinea, Bouteloua aristidoides, Chloris virgata, Eragrostis intermedia, Ipomoea hederacea, Proboscidea parviflora, Rumex hymenosepalus, Solanum elaeagnifolium, 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: Sorghum halepense may naturalize in disturbed areas adjacent to seed sources such as old fields and may invade mesquite bosques.
Similar NVC Types:
Physiognomy and Structure: No Data Available
Floristics: The vegetation is characterized by a moderately dense to dense tree canopy dominated by Prosopis velutina with the exotic, perennial forage grass Sorghum halepense dominating a moderately dense to dense herbaceous layer. Acacia greggii may codominate the tree canopy; scattered short shrubs may also be present but are generally not dense enough to form strata. Common shrubs include Acacia greggii, Lycium spp., Condalia spathulata, Opuntia spinosior, and Ziziphus obtusifolia. The native annual forb Amaranthus palmeri often codominates the herbaceous layer. Other associated herbaceous species include Boerhavia coccinea, Bouteloua aristidoides, Chloris virgata, Eragrostis intermedia, Ipomoea hederacea, Proboscidea parviflora, Rumex hymenosepalus, Solanum elaeagnifolium, 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 960-1060 m (3150-3480 feet) and that stands are found on flats and gentle slopes along drainages and in floodplains on the valley floor. Soils are sandy loam. Sites are typically disturbed by past agricultural activities.
Geographic Range: This vegetation type occurs on valley floor at Buenos Aires National Wildlife Refuge, Arizona, and elsewhere in the desert southwestern U.S. and Sonora, Mexico, near current or past sorghum cultivation.
Nations: MX?, US
States/Provinces: AZ, MXSO?
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: GNA
Greasons:
Concept Lineage:
Predecessors:
Obsolete Names:
Obsolete Parents:
Synonomy: = Prosopis velutina / Sorghum halepense Semi-natural Woodland (Schulz 2004)
Concept Author(s): K.A. Schulz
Author of Description: K.A. Schulz
Acknowledgements:
Version Date: 22Aug2007
References:
  • 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.