Quantitative study of flavonoids in leaves of Citrus plants

Leaf flavonoids were quantitatively determined in 68 representative or econ omically important Citrus species, cultivars, and near-Citrus relatives. Co ntents of 23 flavonoids including 6 polymethoxylated flavones were analyzed by means of reversed phase HPLC analysis. Principal component analysis rev ealed that the 7 associations according to Tanaka's classification were obs erved, but some do overlap each other. Group VII species could be divided i nto two different subgroups, namely, the first-10-species class and the las t-19-species class according to Tanaka's classification numbers.