title: Contribution to a Taxonomic Revision of the Sicilian Helichrysum Taxa by PCA Analysis of Their Essential-Oil Compositions.
abstract: The chemical profile of the essential oils in ten populations of the genus Helichrysum Mill. (Asteraceae), collected in the loci classici of the nomenclatural types of the taxa endemic to Sicily, were analyzed. Our results confirm that the analysis of secondary metabolites can be used to fingerprint wild populations of Helichrysum, the chemical profiles being coherent with the systematic arrangement of the investigated populations in three main clusters, referring to the aggregates of H. stoechas, H. rupestre, and H. italicum, all belonging to the section Stoechadina. The correct nomenclatural designation of the investigated populations is discussed and the following two new combinations are proposed: Helichrysum preslianum subsp. compactum (Guss.) Maggio, Bruno, Guarino, Senatore & Ilardi and Helichrysum panormitanum subsp. latifolium Maggio, Bruno, Guarino, Senatore & Ilardi.
authors.affiliation: Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STeBiCEF), University of Palermo, Viale delle Scienze, Parco d'Orleans II, IT-90128 Palermo. antonella.maggio@unipa.it.
authors.forename: Antonella
authors.initials: A
authors.lastname: Maggio
authors.affiliation: Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STeBiCEF), University of Palermo, Viale delle Scienze, Parco d'Orleans II, IT-90128 Palermo.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Bruno
authors.affiliation: Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STeBiCEF), University of Palermo, Viale delle Scienze, Parco d'Orleans II, IT-90128 Palermo.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Guarino
authors.affiliation: Department of Pharmacy, University of Naples 'Federico II', Via D. Montesano, 49, IT-80131 Naples.
authors.forename: Felice
authors.initials: F
authors.lastname: Senatore
authors.affiliation: DISTEM, University of Palermo, Via Archirafi 26, IT-90123 Palermo.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Ilardi
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry; D036562:Helichrysum / Q000737:chemistry* / Q000145:classification; D009822:Oils, Volatile / Q000737:chemistry* / Q000145:classification; D025341:Principal Component Analysis; D012802:Sicily
chemical_list: D009822:Oils, Volatile
keywords: Essential oils; GC/MS Analysis; Helichrysum; Principal component analysis (PCA); Sicily; Taxonomy