Phenolic constituents of six Hypericum species from Türkiye and their chemotaxonomic relevance

•We provide first detailed phenolic profiles of six Turkish Hypericum L. species.•Results indicate a significant chemodiversirty among the investigated populations.•Results also indicate little chemotaxonomic significance for tested phenolics.•Such data are essential in clarifying evolutionary relationships within the genus Hypericum.•Such data are also crucial in identifying the heterogeneous germplasms.