Opuntia megasperma subsp. orientalis J.T.Howell in Proc. Calif. Acad. Sci., ser. 4, 21: 48. 1933
Opuntia megasperma subsp. orientalis in Proc. Calif. Acad. Sci., ser. 4, 21: 48. 1933
is basionym for Opuntia megasperma var. orientalis in MadroƱo 25: 58. 1978
is basionym for Opuntia galapageia subvar. orientalis, Cactaceae 1: 562. 1958