Distribution of flavonoids in plants was examined with methanolic extracts of about 300 kinds of plant materials by the paper chromatographic method. As a result, it was found that the distribution of flavonoids in plants was very large, as reported by the Late Dr. Keita Shibata, and that a large number of plants contained flavonol. For example, the young green pod of Sophora japonica, measuring about 1-2cm. in length, was found to contain 44.4% of total flavonol which was almost pure rutin. This must be the highest content of flavonols or glycosides in plants known to date.