Tygh Valley Milkvetch

Photo Credit: Oregon Department of Agriculture


  • Species Common Name Tygh Valley Milkvetch
  • Species Scientific Name Astragalus tyghensis
  • State Listing Status Threatened


Special needs

Tygh Valley milkvetch is found on dry, rocky soils with thin, sandy surface soil. This species occurs in bunchgrass grasslands, mounded prairies, or open juniper habitat.

Limiting factors

Tygh Valley milkvetch is endemic to Wasco County. Habitat loss and competition from invasive plants are primary threats to this species. Roadside vegetation control (herbicide spraying) may harm insect pollinators and thereby seed production in some areas.

Conservation actions

Use mowing rather than herbicide spraying to control vegetation at sites where this species occurs. Control invasive plants. Manage grazing at priority sites.

Key reference or plan

Oregon Department of Agriculture Plant Conservation