Eriodictyon angustifolium, common name narrowleaf yerba santa, is a perennial shrub. Usually the butterflies feed on California buckeye, yerba santa, privet, bird droppings, and dung. The following factors can be used to distinguish yerba santa from "E. parryi". It includes yerba santa ("Eriodictyon californica"), along with other similarly named plants. However, yerba santa may grow near or alongside "E. parryi" in disturbed areas.