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Screwbean mesquite
Prosopis pubescens
NatureServe conservation status
Global (G-rank): G3
State (S-rank): S1
External links
Species range
Estimate from download of data from Utah Rare Plant Database on December 8th 2023. Geocat 8 observations: Extent of Occurrence: 190.968 km2. Historic observations over 40 years old were not used. Bench lands, slopes, and terraces along drainages and roadsides in creosote bush, saltbush, Baccharis, and sand sage communities at 730 to 1085 m in Washington County, Utah as well as Arizona, Nevada, California, New Mexico and Texas (Welsh et al. 2015).
Threats or limiting factors
Threats to this species are not well documented. Threats compiled using observations and notes from Utah Rare Plant Database and Utah Geospatial Resource Center GIS Data downloaded in 2023. Severity of impacts are not well known so ranges are provided where appropriate.
In Utah, the main threat to this species is loss of habitat due to the expansion of St. George and surrounding suburbs. There is a possible threat from an overlap of one occurrence of Prosopis pubescens in an area designated as a UREZ phase 1 solar zone. Competition with invasive weeds may also be impacting this species. Throughout it's range it is threatened by many human activities including groundwater pumping and surface water diversion, land clearing and wood cutting, and land uses like grazing (Stromberg 1993).
