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Because of the Snake River's geographical isolation there are a number of plants that have evolved in Hells Canyon that grow nowhere else on earth. Though some species are more widespread, the specific varieties of the species are not.

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List of plants endemic to Hells Canyon

• Arabis crucisetosa Constance and Rollins
• Arabis hastatula Greene
• Astragalus arthurii M.E.Jones
• Astragalus vallaris M.E.Jones
• Calochortus macrocarpus var. maculosus (A.Nels. & J.F.Macbr.) A.Nels. & J.F.Macbr.
• Lomatium rollinsii Mathias and Constance
• Lomatium serpentinum (M.E.Jones) Mathias
• Mimulus hymenophyllus R.J. Meinke
• Phlox colubrina Wherry and Constance
• Ribes cereum var. colubrinum C.L.Hitchc.
• Rubus bartonianus M.E.Peck[1]

References

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