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U.S. DEPARTMENT OF THE INTERIOR

BUREAU OF LAND MANAGEMENT

Oregon / Washington

Recovery: Milkvetch

Milkvetch, Astragalus spp.

Two species of Astragalus in the Prineville District are in danger of being listed as threatened or endangered. Laurence's milkvetch (Astragalus collinus var. laurentii) is a perennial that inhabits dry slopes and is threatened by habitat loss due to agriculture, road maintenance, and competition from non-native plants. Many of the 20 populations of Laurence's milkvetch contain less than 100 individuals each. John Day milkvetch (Astragalus diaphanus var. diurnus), also a perennial, only occurs in open areas on dry, basaltic soils. With 18 of the 20 recorded populations in the BLM's Prineville District, its narrow habitat range consists only of the area along the south fork of the John Day River in Grant County. The effort to ensure that these Astragalus species will not be listed includes completing a census of population sizes, estimating the seed production capabilities of each population, and documenting threats.