Cactaceae
Thelocactus macdowellii
Basionyme et synonymes homotypes
Echinocactus macdowellii Rebut ex Quehl 1894
Echinomastus macdowellii (Rebut ex Quehl) Britton & Rose 1922
Thelocactus macdowellii (Rebut ex Quehl) Glass 1969
Neolloydia macdowellii (Rebut ex Quehl) H.E.Moore 1975
Thelocactus conothelos var. macdowellii (Rebut ex Quehl) Glass & Foster 1977
Echinomastus macdowellii (Rebut ex Quehl) Britton & Rose 1922
Thelocactus macdowellii (Rebut ex Quehl) Glass 1969
Neolloydia macdowellii (Rebut ex Quehl) H.E.Moore 1975
Thelocactus conothelos var. macdowellii (Rebut ex Quehl) Glass & Foster 1977