Out of 8 species and 15 taxa (including hybrids) of Mentha existing in the flora of Turkey, 8 taxa belonging to 6 species were investigated for essential oils. Of 272 samples collected from 181 stations in northern Turkey, 85 were subjected to water distillation and GC/MS analysis. The taxa investigated were as follows: Mentha pulegium, M. suaveolens, M. aquatica, M. spicata var. spicata, M. longifolia ssp. longifolia, M. longifolia ssp. typhoides, M. x dumetorium, M. x villosa-nervata. The authors discuss chemotypic variations based on the results of essential oil analysis, soil analysis and chromosome counts.
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Başer et al. (1999) studied this question.
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