Children (9 direct children, 9 direct and indirect children):
Ferocactus wislizeni var. tiburonensis
Ferocactus wislizeni wislizeni
Ferocactus wislizeni subsp. wislizeni
Ferocactus wislizeni var. herrerae
Ferocactus wislizeni subsp. ajoensis
Ferocactus wislizeni var. ajoensis
Ferocactus wislizeni subsp. herrerae
Ferocactus wislizeni subsp. tiburonensis
Ferocactus wislizeni var. albispinus
Ferocactus wislizeni var. phoeniceus