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Photo by C.Delmatier
Sources: ESRI, USGS, NOAA; C. Delmatier
Guard milkvetch
Astragalus zionis var. vigulus
NatureServe conservation status
Global (G-rank): G4?T1
State (S-rank): S1
External links
Species range
Estimate from download of data from Utah Rare Plant Database on December 5th 2023.
Geocat 10 observations: Extent of Occurrence: 109.313 km2.
Historic observations over 40 years old were not used.
Pinyon-juniper, mountain mahogany, and oak-Garrya communities at 1800 to 2500 m on the east side of the Pine Valley Mountains, Washington Co.; a Virgin Basin endemic (Welsh et al 2015).
Threats or limiting factors
The main threats are from habitat degradation due to grazing, invasive species, and drought.
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. The largest threat is due to numerous fires in the Pine Valley Mountains. Recreational use of habitat, such as foot traffic, dispersed camping and OHV related activities, may pose a threat to some populations throughout its range. As the human population grows in areas within easy access to habitat and as recreational use increases, the impacts may become substantially more significant. Road maintenance may also impact occurrences near roads. Climate change, including drought, may also be impacting this species throughout it's range.
