Sterile Milkvetch

Photo Credit: Oregon Department of Agriculture


  • Species Common Name Sterile Milkvetch
  • Species Scientific Name Astragalus cusickii var. sterilis
  • State Listing Status Threatened


Special needs

Sterile milkvetch is endemic to the Owyhee Uplands. This species occurs along the Owyhee River, in bare gravelly and clay soils derived from weathered volcanic ash.

Limiting factors

Grazing by domestic livestock, mining, and weed invasion are among threats to this species.

Conservation actions

Fence populations on public land to reduce impacts from off-road vehicles and grazing. Conduct long-term monitoring. Limit range improvement projects in sensitive areas.

Key reference or plan

Oregon Department of Agriculture Plant Conservation