The National Conservatory of Medicinal, Aromatic and Industrial Plants at Milly-la-Forêt, France, cloned 70 individual plants selected according to macromorphological criteria in 59 populations of diverse origins. They were described and compared in terms of 33 features using main component analysis (MCA). The chemical compositions of the oils isolated from each clone allowed a classification in six groups. The main components were respectively: sabinene, germacrene D, β-caryophyllene, cis-sabinene hydrate, terpinen-4-ol and hydrocarbon monoterpenes. No correlation could be found between morphological structure and chemical composition.
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Chalchat et al. (1998) studied this question.
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