Monotypic Cucurbitales genera

Hillebrandia sandwicensis is a species of a herbaceous perennial flowering plant native to some of the Hawaiian Islands. Common names include akaakaawa and pua maka nui. The genus name honors the German physician William Hillebrand.

Apodanthes is a genus of flowering plants in the family Apodanthaceae. It has only one currently accepted species, Apodanthes caseariae, native to Central America and northern South America. It is a holoparasite that lives inside plants from the families Salicaceae and Fabaceae, and emerges only to flower.

Tetrameles is a genus of flowering plants in the family Tetramelaceae with one species, Tetrameles nudiflora. It grows as a large deciduous tree and is found across southern Asia from India through southeast Asia, Malesia, and into northern Australia.

Combretocarpus is a monotypic genus of tree in the Anisophylleaceae family. The generic name '' is from the Greek, referring to the resemblance of its fruit to that of the genus Combretum. The Plant List recognises the single species Combretocarpus rotundatus''.

Poga is a genus of flowering plants in the family Anisophylleaceae. It has only one currently accepted species, Poga oleosa, a large tree found from southeast Nigeria to Gabon. Its common names include afo nut, inoi/inoy nut and poga. Its seeds are dispersed by forest elephants (Loxodonta cyclotis). Local people collect and sell the edible nuts for their oil. The wood, known as ovoga, is used for veneers, furniture and boxes.

Octomeles is a monotypic genus of plant in family Tetramelaceae. The sole species is Octomeles sumatrana, sometimes written O. sumatranum.