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Photo by Andrea Hazelton
Sources: ESRI, USGS, NOAA
Cronquist Milkvetch
Astragalus cronquistii
NatureServe conservation status
Global (G-rank): G2
State (S-rank): S2
External links
Phenology
This species flowers between April and June.
Species range
A Navajo Basin endemic, found in San Juan County, Utah and Montezuma County, Colorado.
Habitat
A Utah Flora 2015: The species occupies two disjunct areas in San Juan Co., Utah; i.e., Comb
Wash (Permian Cutler Formation) and the Aneth vicinity (Jurassic Morrison
Formation), but the principal distribution of the species is in southwestern
Colorado (on Mancos Shale). Its propensity for fine-textured, seleniferous
substrates is evident, but the plant does not have the characteristic odor of
selenium. The subterranean stems are an adaption that allows this plant to
survive well below the surface during periods of drought.
Threats or limiting factors
The threats to this species include recreation, grazing, mining, climate change, road and utility line maintenance. This species is more tolerant to drought due to the adaptation of subterranean stems that allow this plant to survive below the surface during periods of drought (Welsh et al. 2015).
