Children (6 direct children, 6 direct and indirect children):
Tephrocactus articulatus var. papyracanthus
Tephrocactus articulatus var. calvus
Tephrocactus articulatus f. papyracanthus
Tephrocactus articulatus var. articulatus
Tephrocactus articulatus var. oligocanthus
Tephrocactus articulatus var. strobiliformis