Gymnanthes is a genus of flowering plants in the spurge family, Euphorbiaceae, first described as a genus in 1788.

[3][1] It is found primarily in the warmer parts of the Western Hemisphere (from Florida and Mexico south to Argentina), but with some species in central Africa and southwestern Southeast Asia.

[2][4][5][6][7] Members of the genus are commonly known as oysterwood.

[8] The genus has 45 species and is pantropical.

moved to other genera: Actinostemon Ditrysinia Microstachys Sebastiania Stillingia