Opuntia ×fosbergii C.B.Wolf in Occas. Pap. Rancho Santa Ana Bot. Gard. 1(2): 79. 1938
Opuntia ×fosbergii in Occas. Pap. Rancho Santa Ana Bot. Gard. 1(2): 79. 1938
is basionym for Cylindropuntia ×fosbergii in J. Arizona-Nevada Acad. Sci. 33: 150. 2001
is basionym for Grusonia ×fosbergii in Tephrocactus Study Group 12(3): 44. 2006