Annonaceae, a family of the dicotyledonous plant class Magnoliina. It is the largest family in the order Magnoliales. There are about 120 genera and 2,100 species, widely distributed in tropical and subtropical regions of the world, especially in the Eastern Hemisphere. There are 24 genera, 103 species, and 6 varieties in my country, which are distributed from the southwest to Taiwan. Most of them are produced in South China, and a few are distributed in East China. . The Annonaceae have relatively primitive traits and were called "living fossils" by Darwin. Fossils have been discovered in the Cretaceous and Tertiary periods. This family is most closely related to the Magnoliaceae family. This family includes 2 subfamilies and 5 tribes: Annonaceae, with carpels arranged in a spiral shape and free of birth. It is divided into 4 tribes: ① Purple Jade Pan Tribe; ② Sweet Apple Tribe; ③ Ye Duhuo Tribe; ④ Four-petal Wood Tribe. Unipodiae, carpels arranged annularly, connate, parietal placenta. Clan 1: Single pocket clan.