The thesis is mainly discussing the wild surveying and identification of swertia medicinal plants in sichuan and hubei provinces . the scanning electron microscope shows that the pollen grains of 12 species are all simple grain pollen 为此，有必要对其药材的植物基源、性状和显微鉴别特征、化学成分进行研究，建立和完善本类药材的质量评价体系，从而指导开发和利用。
