Iridoid and secoiridoid glycosides in a hybrid complex of bush honeysuckles (Lonicera spp., Caprifolicaceae): Implications for evolutionary ecology and invasion biology

► Hybrid honeysuckles have a diversity of iridoid glycosides inherited from both parent species. ► Fruits have different compositions and higher concentrations of iridoid glycosides than leaves. ► Hybrid honeysuckles provide an excellent model system for research in evolutionary ecology.