- Subfamily Pereskioideae: broad leaves, no glochids.
Pereskia, Maihuenia
(or Maihuenia may be separated into Subfamily Maihuenioideae.)
- Subfamily Opuntioideae: fleshy round leaves present or absent, glochids present.
Austrocylindropuntia, Brasiliopuntia, Cylindropuntia, Cumulopuntia, Grusonia, Micropuntia, Opuntia, Pereskiopsis, Pterocactus, Quiabentia, Tacinga, Tephrocactus, Tunilla.
- Subfamily Cactoideae: no leaves*, no glochids.
Ariocarpus, Astrophytum, Aztekium, Carnegiea, Cereus, Cleistocactus, Coryphantha, Echinocactus, Echinocereus, Echinomastus, Epithelantha, Escobaria, Ferocactus, Geohintonia, Hylocereus, Leuchtenbergia, Lobivia, Lophophora, Mammillaria, Matucana, Neolloydia, Obregonia, Parodia, Pelecyphora, Pilosocereus, Pediocactus, Rebutia, Rhipsalis, Sclerocactus, Schlumbergia, Stenocactus, Strombocactus, Thelocactus, Trichocereus, Turbinocarpus, Uebelmannia and all other genera.
*Except that some species have seed leaves.
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