Alder Buckthorn, Alder-leaf Buckthorn, Alder-leaved Coffeeberry: Rhamnus alnifolia -
California Coffeeberry, Coffeeberry: Rhamnus californica ssp. occidentalis (Synonym: Frangula californica, Frangla californica ssp. occidentalis, Rhamnus californica var. occidentalis) -
Holly-leaf Redberry, Redberry: Rhamnus ilicifolia (Synonyms: Rhamnus crocea, Rhamnus crocea ssp. ilicifolia) -
Buckthorn, Cascara, Chittam: Rhamnus purshiana (Synonyms: Frangula purshiana, Frangula purshiana ssp. annonifolia, Frangula purshiana ssp. purshiana) - Note: This taxon is referred to as Frangula purshiana ssp. purshiana in Washington.
Sierra Coffeeberry: Rhamnus rubra (Synonyms: Frangula rubra, Frangula rubra ssp. rubra)