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Quassia (// or //) is a plant genus in the family Simaroubaceae. Its size is disputed; some botanists treat it as consisting of only one species, Quassia amara from tropical South America, while others treat it in a wide circumscription as a pantropical genus containing up to 40 species of trees and shrubs. The genus was named after a former slave from Suriname, Graman Quassi in the eighteenth century. He discovered the medicinal properties of the bark of Quassia amara.
Members of the genus are found in the Tropics throughout the world. Countries and regions where species are native include: Andaman Islands, Angola, Bangladesh, Belize, Benin, Bismarck Archipelago, Borneo, North and Northeast Brazil, Burkina, Cabinda, Cambodia, Cameroon, Central African Republic, Chad, Colombia, Comoros, Congo, Costa Rica, El Salvador, Equatorial Guinea, Gabon, Gambia, Ghana, Guatemala, Guinea, Guinea-Bissau, Gulf of Guinea Islands, Honduras, India, Ivory Coast, Kenya, Laos, Leeward Islands, Liberia, Madagascar, Malaya, Mali, Central, Southeast and Southwest Mexico, Myanmar, New Guinea, Nicaragua, Niger, Nigeria, Northern Territory, Panamá, Philippines, Queensland, Senegal, Sierra Leone, Solomon Islands, Sri Lanka, Sudan, Sulawesi, Sumatera, Tanzania, Togo, Trinidad-Tobago, Uganda, Venezuela, Vietnam, Windward Islands, Zambia, and Zaïre.
The plant is naturalised in the following places: Cuba, Dominican Republic, Haiti, Jamaica, Jawa, and Puerto Rico.
Accepted species of the genus, as of February 2021, are:
There are also taxa that have not been assigned a formal status: