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Quassia is a flora genus in the family Simaroubaceae. Its size is disputed; some botanists treat it as consisting of only one species, <i>Quassia amara</i> 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.<br/><br/> The genus was named after a former slave from Surinam, Graman Quassi in the eighteenth century. He discovered the medicinal properties of the bark of <i>Quassia amara</i>.