Contents of total flavonoids in above-ground part of Stenoloma chusanum(L.) Ching collected from different production regions were analyzed.The results showed that total flavonoid content in above-ground part of S.chusanum collected from Qiubei of Yunnan Province was the highest,reached to 127.461 mg·g-1,and could keep the high content after transplanted to Nanjing of Jiangsu Province.The total flavonoid content in leaf blade was obviously higher than that in leaf stalk.It is suggested that S.chusanum from Qiubei is an excellent resources and the leaf blade of S.chusanum should be used mainly.
The dynamic change of total flavonoids content in above-ground part of Gynura bicolor (Willd. ) DC. and G. divaricata (L. ) DC. from two locations was researched. The result shows that the total flavonoids content in G. bicolor and G. divaricata leaf is lower in June and July,higher in the beginning and the middle of August and then has a certain decrease with a great fluctuation. Total flavonoids content in leaf of G. bicolor reaches the highest with a value of 12.031 mg·g-1 at the 15th August,and that in leaf of G. divaricata-1(from Zhejiang of China) and G. divaricata-2 (from South America) is the highest at the 1st August with a value of 17.381 and 19.935 mg·g-1,respectively. The total flavonoids content in leaf of G. bicolor and G. divaricata is higher than that in stem. Except leaf of G. divaricata-2,the total flavonoids content in stem and leaf appears decreasing trend from upper to lower part gradually. Therefore,taking total flavonoids content for an index,it is suitable to harvest upper leaf of G. bicolor,upper leaf and stem of G. divaricata-1,and whole leaf of G. divaricata-2 in August.
