McDonald’s Rockcress

Photo Credit: Oregon Department of Agriculture


  • Species Common Name McDonald's Rockcress
  • Species Scientific Name Arabis macdonaldiana
  • Federal Listing Status Endangered
  • State Listing Status Endangered


Special needs

McDonald's rockcress occurs in serpentine, fairly barren habitat, usually on steep, unstable slopes or dry, open woods. These sites are often recently disturbed and below 5900 feet in elevation.

Limiting factors

Threats to McDonald's rockcress include slope erosion, road maintenance, logging, nickel-mining, over-collection, and off-road vehicle use. Vegetation succession may also render habitat unsuitable over time.

Conservation actions

Conduct surveys to locate new populations. Collect and bank seeds from Oregon populations. Minimize disturbance at priority sites during the growing season.

Key reference or plan

Oregon Department of Agriculture Plant Conservation