Endangered and Threatened Wildlife and Plants; Revised Designation of Critical Habitat for Astragalus magdalenae var. peirsonii (Peirson's Milk-Vetch)

We, the U.S. Fish and Wildlife Service (Service), are designating final revised critical habitat for Astragalus magdalenae var. peirsonii (Peirson's milk-vetch) under the Endangered Species Act of 1973, as amended (Act). In total, approximately 12,105 acres (ac) (4,899 hectares (ha)) fall within the boundaries of the revised critical habitat designation for A. m. var. peirsonii. The revised critical habitat is located in Imperial County, California. We are excluding Unit 2 from this revised designation based on the disproportionate economic and social impacts associated with the designation of this unit relative to the other units designated as critical habitat. This final revised designation constitutes a reduction of 9,758 ac (3,949 ha) from our 21,863 ac (8,848 ha) previous final designation of critical habitat for A. m. var. peirsonii published in 2004.