Packera layneae

The plant is endemic to California, where it is only known from the western slopes of the northern Sierra Nevada foothills.

Packera layneae grows in cismontane chaparral and oak woodlands habitats of the California Interior chaparral and woodlands ecoregion, often on serpentine soils and weathered gabbro.

[3] The plant grows in chaparral and woodlands habitats that are dependent on a fire ecology of periodic wildfires.

Fire suppression efforts alter available sunlight for germination and ongoing growth, and delay the natural 'biomass maintenance' of all plants in this ecosystem.

[3] Other threats include development, mining, off-road vehicle use, grazing, and the increasing presence of invasive plants.