Principal component analysis and correlation analysis of elements in Flos Chrysanthemi Indici from different regions Pre treatment in determining total polysaccharide in Flos Chrysanthemi Indici by response surface design Simultaneous determination of six flavonoids in Flos Chrysanthemi Indici by RP-HPLC Determination of chlorogenic acid, caffeic acid and linarin in Flos Chrysanthemi Indici from different places by RP-HPLC Chemical Components of Essential Oils From Flos Chrysanthemi Indici in Different Areas Determination of linarin and luteolin in Flos Chrysanthemi Indici by HPLC