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U.S. Forest Service

Threatened, Endangered, and Proposed (TEP) Plant Profile

Packera layneae, Layne’s butterweed. Layne’s butterweed flower heads. Photo by Teresa Prendusi.

Packera layneae, Layne’s butterweed. Layne’s butterweed, Eldorado National Forest. Photo by S. Tyron.

Packera layneae, Layne’s butterweed habitat. Layne's butterweed is found on gabbro or serpentine derived soils, in rocky areas in chaparral, woodland, and forest. Photo by Linnea Hanson, Plumas National Forest.

Packera layneae, Layne’s butterweed range map. Packera layneae range map.

Packera layneae, Layne’s butterweed

ESA Status

Visit the U.S. Fish & Wildlife Service Species Profile link below for links to listing and other USFWS documents.

  • Listed as: Senecio layneae
  • PLANTS Database Name: Packera layneae
  • Listed Threatened 1996
  • Recovery Plan 2002 (PDF, 5.4 MB)


  • Rural and residential development
  • Changes in surface hydrology
  • Loss and fragmentation of habitat to residential and commercial development
  • Alteration of natural fire regime
  • Suppression of disturbance
  • Lesser threats include road widening and maintenance, off-road vehicle use, garbage dumping, horse paddocking, mining, competition with invasive nonnative plants, and other human-caused conditions associated with increased development

Conservation Status

National Forest and Grassland Occurrence

More Information