Abstract
The distribution of myricetin, quercitin, kaempferol, leuco-delphinidin, leuco-cyanidin and the autumnal anthocyanidins delphinidin, cyanidin and malvidin in the leaves of 14 Hamamelidaceae and 15 Anacardiaceae is reported. It is shown that instead of quercetin, usually characteristic for the leaves (and also present here), myricetin predominates in these families. The identity of the flavonols was made certain by comparison of the ultraviolet and infra-red spectra with those of authentic samples, by isolation from several species and also by reduction to the corresponding anthocyanidins.