Rhizoma Heterosmilacis Japonicae is the dried tuber of Heterosmilax japonica Kunth., Heterosmilax yunnanensis Gagnep. or Heterosmilax chinensis Wang.. Rhizoma Heterosmilacis Japonica is used in clinic as an important Traditional Chinese Medicine (TCM). 12 samples of Rhizoma Heterosmilacis Japonica were purchased from TCM shops or straightly collected from the plant habitats in different places of China. The present study provided the methods to isolate constituents, determined the general flavono...