- a shrub, Rhamnus purshiana (or Frangula purshiana), of the buckthorn family, of the Pacific coast of the United States, having finely toothed leaves and flowers in umbels and yielding cascara sagrada.
- See cascara sagrada
- a shrub or small tree, Rhamnus purshiana of NW North America, whose bark is a source of cascara sagrada: family Rhamnaceae
