UHPLC-DAD-MS/MS analysis of extracts from linden flowers (Tiliae flos): Differences in the chemical composition between five Tilia species growing in Europe

•Flowers of five Tilia species were analysed phytochemically.•A validated method for quantification of phenolics was developed.•Chemometric analysis revealed intra species differences in chemical composition.•A hierarchical key for identification of linden flowers was developed.•Major flavonoids and phenolic acids were isolated from Tilia cordata.