The content of flavonoids as a sort of secondary metabolites in Spartina alterniflora, was rather rich. It was highest in the salt marsh plant growing near the estuary of old Yellow River, Binhai county, Jiangsu province, in October, 1989, and the percentage was over 0.6% with water extraction alone.The production of TFS (total flavonoids of S alterniflora)was dependent on seasons and environmental factors. It was positively correlated to the primary production of the plant.In the14C labelled photosynthesis...