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    Essential Oil Composition of Two Endemic Centaurea Species From Turkey, Centaurea Mucronifera and Centaurea Chrysantha, Collected in the Same Habitat
    (Pergamon-Elsevier Science Ltd, 2003) Dural, Hüseyin; Bağcı, Yavuz; Ertuğrul, Kuddusi; Demirelma, Hakkı; Flamini, Guido; Cioni, Pier Luigi; Morelli, Ivano
    The essential oils of two endemic Centaurea species from Turkey, C. mucronifera and C. chrysantha, collected in the same habitat, have been studied. The main compounds of the former were germacrene D (29.3%), beta-eudesmol (17.4%) and beta-caryophyllene (7.3%), while in the latter germacrene D (27.4%), caryophyllene oxide (9.5%) and bicyclogermacrene (5.4%) were detected among its major constituents. The two species produced many similar compounds in their essential oils that could be justified by the similar ecological conditions of their habitat, but also many differences were found that could confirm their taxonomic separation. (C) 2003 Elsevier Ltd. All rights reserved.
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    Essential Oils From Lowers of Centaurea Kotschyi Var. Kotschyi and C-Kotschyi Var. Decumbens From Turkey
    (Wiley, 2003) Ertuğrul, Kuddusi; Dural, Hüseyin; Tugay, Osman; Flamini, Guido; Cioni, Pier Luigi; Morelli, Ivana
    The compositions of the essential oils obtained from. fresh capitula of Centaurea kotschyi var. kotschyi and Centaurea kotschyi var. decumbens, two endemic plants from Turkey, have been studied. Sesquiterpenes were the main components of both essential oils, with germacrene D (44.2%), beta-caryophyllene (12.1%) and bicyclogermacrene (5.5%) in C. kotschyi var. kotschyi and germacrene D (29.4%), beta-caryophyllene (11.2%), beta-cedrene (7.1%) in C. kotschyi var. decumbens as the principal components. The qualitative and quantitative differences between the two essential oils are in agreement with,the morphological observation that led to the differentiation of the two varieties. Copyright (C) 2003 John Wiley Sons, Ltd.