02432nas a2200277   4500008004100000245008900041210006900130260027100199300001400470490000700484520128500491653001901776653001101795653003001806653001401836653002401850653002001874100002901894700001701923700002001940700002701960700001801987700003402005700001802039856009702057       2000                        eng d00aEssential oil composition and variability of Thymus lotocephalus and Thymus x mourae0 aEssential oil composition and variability of Thymus lotocephalus  aAffiliation: Laboratório de Farmacognosia, Faculdade Farmacia, Univ. C., Coimbra, Portugal; Affiliation: Unitat de Farmacol. I Farmacog., Facultat Farmacia, Univ. B., Barcelona, Spain; Affiliation: Departament de Quimiometria, Inst. Quimic de Sarria, E-c2000/06//  a457 - 4700 v283 aThe composition of the essential oils of four populations of Thymus lotocephalus G. Lopez and R. Morales and one population of T. x mourae Paiva and Salgueiro, two endemic taxa from Portugal, was investigated mainly by GC and GC-MS. T x mourae is a natural hybrid between T. lotocephalus and T. mastichina (L.) L. subsp, donyanae R. Morales, which essential oil was analysed for the first time. In its oil, it was possible to find compounds of both parents, which could enable us to confirm its intermediate status between those two taxa. 1,8-Cineole and borneol were the main constituents in the essential oil of T. x mourae, whereas linalool, geranyl acetate and 1,8- cineol were the major ones in T. lotocephalus. Intermedeol was also an important constituent in the oils of both taxa. Nevertheless, the volatile oils of the four populations investigated of T. lotocephalus showed important differences among the main constituents. In order to study their infraspecific variability, the results obtained in the analysis of individual plants were submitted to a Principal Component and Chemometric Cluster Analyses. Five types of essential oils were found: linalool, 1,8-cineole, linalool/1,8-cineole, linalyl acetate/linalool and geranyl acetate. (C) 2000 Elsevier Science Ltd.10aEssential oils10aGC- MS10aInfraspecific variability10aLamiaceae10aThymus lotocephalus10aThymus x mourae1 aSalgueiroa, Lı́gia, R.1 aVilab, Roser1 aTomàsc, Xavier1 aCañigueralb, Salvador1 aPaivad, Jorge1 ada Cunhaa, António, Proença1 aAdzet, Tomàs  uhttp://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0034101406&partnerID=40&rel=R6.5.0