Opuntia phaeacantha var. piercei Fosberg in Bull. S. Calif. Acad. Sci. 33(2): 102–103. 1934
Opuntia phaeacantha var. piercei in Bull. S. Calif. Acad. Sci. 33(2): 102–103. 1934
is basionym for Opuntia ×occidentalis var. piercei in Aliso 4: 94. 1958
is basionym for Opuntia littoralis var. piercei in Ann. Missouri Bot. Gard. 52(3): 270. 1965