Tephrocactus nigrispinus subsp. atroglobosus Tephrocactus nigrispinus subsp. nigrispinus
Tephrocactus hegenbartianus Opuntia nigrispina Maihueniopsis nigrispina Opuntia purpurea Platyopuntia nigrispina Pseudomaihueniopsis nigrispina
Taxonomic data from World Flora Online, accessed June 20, 2024