Astragalus zionis is a species of legume known by the common name Zion milkvetch. It is one of the earliest flowers to bloom in Zion canyon. First described by botanist Marcus E. Jones in 1895, the species has also been placed in the defunct genus Xylophacos under the name Xylophacos zionis. The variety Astragalus zionis var. vigulus, the guard milkvetch, was described by Stanley Welsh in 1993.

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