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

Polemonium elusum.
Polemonium elusum is an 8-20 inch tall perennial Jacob's ladder recently discovered in the mountains and foothills of east-central Idaho. Photo by Josh Irwin.

Polemonium elusum.
Close-up of the pale-blue to white flowers of the elusive Jacob's-ladder. This species exhibits a distinct transluscent membrane between the calyx lobes. Photo by Josh Irwin.

Polemonium elusum.
The two-lobed pinnnate leaves are mostly basal with a leaf structure that reflects both alpine and lower elevation species characteristics. Photo by Josh Irwin.

Polemonium elusum habitat.

Polemonium elusum habitat.
Polemonium elusum is found in several plant communities where vegetation transitions from sagebrush to Mountain mahogany to Douglas Fir woodland. Photo by Josh Irwin.

Polemonium elusum range map.
Polemonium elusum range map. USDA NRCS PLANTS Database.

Polemonium elusum, elusive Jacob's-ladder

Threats

  • Small population size.
  • Narrow distribution.
  • Herbivory by ungulates.
  • Invasive species encroachment into habitat.

Conservation Status

National Forest and Grassland Occurrence

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