Eriodictyon trichocalyx is a species of flowering plant in the Boraginaceae (Forget-me-not) family known by the common name I is native to southern California and Baja California where it grows in several habitat types, including chaparral and grassland There are two recognized varieties with different ranges - var. lanatum is restricted to the Peninsular Range of San Diego County. Var. trichocalyx is restricted to the Transverse Range. It is a shrub growing erect up to about 2 meters tall, with lance-shaped to oval leaves up to 14 centimeters long. They are hairless and resinous to densely woolly. The inflorescence is a cluster of white to light purple bell-shaped flowers. A closely related species is Thick-leaf Yerba Santa (E. crassifolium) which is somewhat more common in chaparral. All members of this genus are valuable nectar plants for butterflies.yerba san. It is native to southern California and Baja California, where it grows in several habitat types, including chaparral and grassland. It is a shrub growing erect up to about 2 meters tall, with lance-shaped to oval leaves up to 14 centimeters long. The flowers of E. t. var. lanatum are white to light purple.