Quassia is a genus
? of evergreen
? tropical
? Asian
? trees and shrubs
? (family
Simaroubaceae), counting about 40
species. Best known is Bitterwood
? (
Quassia amara), a tree up to 6 meters (20 feet) tall. Its heartwood
? contains quassiin
?, a bitter-tasting substance that was used in
medicine.