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[The historical conditions of introduction and diffusion of American ginseng in the Qing Dynasty].

The American ginseng (Panax quinquefolium L.), originally a native product of the United States and Canada, was introduced into China in the Qing Dynasty, and then spread and applied extensively. This was closely related to the contemporary exchange between China and foreign counties, which became the cultural background for the introduction of American ginseng; the development of pharmacology, which contributed to the commercial opportunity for its diffusion; the shortage of resources of ginseng, resulting in the urgent need for its introduction; and the publication of popular books of materia medica, which accelerated the velocity of its diffusion.