Taxonomy
Cereoideae is a subfamily of the big family Cactaceae. It is also named Core Cactoideae 1. In Plant theory 1 Cactaceae was not split in Subfamilies and placed in Subphase 4 in Portulacales.
In Plant theory 2 Cactaceae is split in 4 Subfamilies and Cereoideae is placed in Subphase 7. It includes the epiphytic Rhipsalidae and Notocacteae.
Botany
Barrel like, erect, ribbed cacti.
Notocacteae: solitary.
Rhipsalideae: shrubby, non-erect, epiphytic.
Subfamilies
Trichocereinae: Acanthocalycium, Anhaloniopsis, Arthrocereus, Brachycereus, Chamaecereus,Cleistocactus, Denmoza, Discocactus, Echinopsis, Espostoa, Espostoopsis, Facheiroa, Haageocereus, Harrisia, Lobivia, Leucostele, Matucana, Mila, Oreocereus, Oroya, Pygmaeocereus, Rauhocereus, Reicheocactus, Samaipaticereus, Setiechinopsis, Soehrensia,Trichocereus, Vatricania, Weberbauerocereus, Yungasocereus.
Cereinae: Arrojadoa, Bragaia, Brasilicereus, Cereus, Cipocereus, Coleocephalocereus, Facheiroa,Leocereus, Melocactus, Micranthocereus, Pierrebraunia, Pilosocereus, Praepilosocereus,Stephanocereus, Subpilocereus.
Rebutiinae: Aylostera, Browningia, Cintia, Gymnocalycium, Lasiocereus, Rebutia, Stetsonia,Uebelmannia, Weingartia.
Notocacteae: Austrocactus, Bolivicactus, Brasilicactus, Eriocactus, Eriosyce, Eulychnia, Islaya,Neowerdermannia, Notocactus, Ritterocactus, Parodia, Wigginsia, Yavia.
Rhipsalideae: Hatiora, Lepismium, Rhipsalis, Schlumbergera.