USDA Forest Service Celebrating Wildflowers
Critically Imperiled Plant Profile
(Not Listed or Proposed under the Endangered Species Act)
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.
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.
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 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. USDA NRCS PLANTS Database.
Polemonium elusum, elusive Jacob's-ladder
- Small population size.
- Narrow distribution.
- Herbivory by ungulates.
- Invasive species encroachment into habitat.
National Forest and Grassland Occurrence
U.S. Forest Service
1400 Independence Ave., SW, Mailstop Code: 1103
Washington DC 20250-1103
Last modified: Friday, 05-Apr-2013 16:20:43 EDT