Opuntia echinocarpa var. wolfii L.D.Benson in Cact. Succ. J. (Los Angeles) 41: 33. 1969
Opuntia echinocarpa var. wolfii in Cact. Succ. J. (Los Angeles) 41: 33. 1969
is basionym for Cylindropuntia wolfii in J. Arizona-Nevada Acad. Sci. 332: 150. 2001
is basionym for Grusonia wolfii in Tephrocactus Study Group 12(3): 45. 2006
is basionym for Opuntia wolfii in Madroño 39(2): 108. 1992