Tetradium is a genus of about 5 to 10 species of trees in the family Rutaceae, occurring in temperate to tropical east Asia. In cultivation in English-speaking countries, they are known as Euodia, Evodia, or Bee bee tree. Tetradium species are used as food plants by the larvae of some Lepidoptera species including Aenetus scotti and Endoclita damor. The genus is closely related to Melicope and is sometimes included within it.