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獐牙菜属（Swertia）隶属于龙胆科，约有170种，主要分布于亚洲、非洲和北美洲，中国约有79种、其中作药用的约有35
Swertia belongs to the genus Gentiana and has about 170 species, mainly distributed in Asia, Africa and North America. There are about 79 species in China and about 35 of them are used medicinally.