Variability in essential oil composition of Piper dilatatum L.C. Rich

► The essential oils of twelve specimens of Piper dilatatum occurring in the Amazon were analyzed. ► The oils were grouped into seven groups based on hierarchical analysis. ► The sesquiterpenes hydrocarbons and oxygenated sesquiterpenes predominate in these oils, with very different structural types. ► This is a chemotaxonomic contribution to better understanding of Piper species.