[Discussion on forming pattern of dao-di herbs Ligusticum chuanxiong]

As a famous-region Dao-di Herbs, Ligusticum chuanxiong which mainly grows in the west of the upper reaches of Jinma River in Dujiangyan for a long time. In recent years, the history, species and origin of L. chuanxiong were researched by many scholars. However, the forming pattern of Dao-di herbs of L. chuanxiong has not been reported systematically. Basing on the general principles of the formation of Dao-di herbs, it can be concluded that the forming pattern of L. chuanxiong is the type of two determinants, which are combined both unique ecological environment of genuine regions and advanced cultivation techniques.