Ailanthus (; derived from ailanto, an Ambonese word probably meaning "tree of the gods" or "tree of heaven") is a genus of trees belonging to the family Simaroubaceae, in the order Sapindales (formerly Rutales or Geraniales). The genus is native from east Asia south to northern Australasia. One species, the tree of heaven (Ailanthus altissima) is considered a weed in some parts of the world.

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