Monotypic Oxalidales genera

Cephalotus ( or ; Greek: κεφαλή "head", and οὔς/ὠτός "ear", to describe the head of the anthers) is a genus which contains one species, Cephalotus follicularis the Albany pitcher plant, a small carnivorous pitcher plant. The pit-fall traps of the modified leaves have inspired the common names for this plant, which also include Western Australian pitcher plant, Australian pitcher plant, or fly-catcher plant. It is an evergreen herb that is endemic to peaty swamps in the southwestern corner of Western Australia. As with the unrelated Nepenthes, it catches its victims with pitfall traps.

Caldcluvia is a monotypic genus of flowering plants in the family Cunoniaceae. The only species in the genus is Caldcluvia paniculata, known as tiaca, an evergreen tree native to Chile. It is found from Ñuble to Aisén (36 to 45°S). Most species that were previously placed in the genus are now placed in Ackama, Opocunonia and Spiraeopsis.

Opocunonia is a monotypic genus of trees in the family Cunoniaceae. Its only species is Opocunonia nymanii, synonym Caldcluvia nymanii. It is native to New Guinea and the Bismarck Archipelago.