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U.S. Forest Service

Critically Imperiled Plant Profile (Not Listed or Proposed under the Endangered Species Act)

Perideridia erythrorhiza flowers. Characters of their roots, leaves, and fruits distinguish Yampah species from each other, almost anything other than their flowers, which always look pretty much like these. Photo by Lois Shoemaker.

View of Perideridia erythrorhiza growing in a meadow at Mud Spring. A few of the known populations of this species have more than 10,000 individuals. Most are much smaller. Photo by Lois Shoemaker.

Redroot yampah. Redroot yampah is a member of the carrot family. Photo by Melissa Carr.

Perideridia erythrorhiza range map. Perideridia erythrorhiza range map.

Perideridia erythrorhiza, western yampah

  • Also known as: red-root yampah


  • Housing and agricultural development
  • Competition with invasive exotic plants
  • Grazing
  • Herbicides
  • Altered hydrology due to nickel mining
  • Possibly also threatened by off-road vehicles

Conservation Status

National Forest and Grassland Occurrence

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