Samadera indica, the bitter wood or Niepa bark tree, is a species of plant in the family Simaroubaceae. It is a shrub or tree and grows primarily in wet tropical regions, from west Africa, through India, then down through Indonesia to Malesia.

Quassia 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.