Fennel (scientific name: Illicium verum L.) is also known as crab crab, crab crab, Osmanthus fragrans, Illicium verum L. (Flora of Medicinal Plants in Tianmu Mountain of Zhejiang Province), Crab Wood, Illicium verum L., crab crab, Crab Tree, Huang Nan, Tiekusan, Akebia Akebia, Daxiangshu and Illicium verum L. (common medicinal materials in Zhejiang Province). Evergreen shrubs or small trees. The flowers are bright red, and 1-3 gathers leaf axils or branch tops. Cold tolerance is not strong, but it needs protection in winter north of the Yellow River. It is a good ornamental tree species in Central China. Reproduction can sow. At the temperature of-12℃, it is not damaged by freezing and drought. Both leaves and fruits contain aromatic oil, and roots and bark can be used as medicine. Fennel is a national second-class protected plant, with scarce wild resources and difficult artificial cultivation. 1