The essential oils of Nepeta cataria L., N. X faassenii Bergm. ex Stearn, N. nepetella L., N. sibirica L. and N . nuda L., isolated by steam distillation, were analysed by GC and GC-MS. The compositions of the oils were submitted to a cluster analysis by application of the CLUSTAN program, with a view to testing their use in chemotaxonomy.
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