Leaf cuticular alkanes of Solanum subg. Leptostemonum Dunal (Bitter) of some northeast Brazilian species: Composition and taxonomic significance

► Thirty-one alkanes were identified in the epicuticular wax of nine species of Solanum subg. Leptostemonum. ► Tritriacontane was the major constituent in most species. ► Three clusters were identified. ► The profiles of alkanes showed some qualitative taxonomic value for species analyzed.