Opuntia littoralis var. piercei (Fosberg) L.D.Benson & Walk. in Ann. Missouri Bot. Gard. 52(3): 270. 1965
Opuntia littoralis var. piercei in Ann. Missouri Bot. Gard. 52(3): 270. 1965
is new combination for Opuntia phaeacantha var. piercei in Bull. S. Calif. Acad. Sci. 33(2): 102–103. 1934