The essential oils of the two subspecies glandulosa and nepeta of Calamintha nepeta (L.) Savi are known to contain a p-menthane skeleton oxygenated in the C-3 position. The particular richness in piperitone oxide of the essential oil obtained from a sample of the ssp. nepeta collected in Urbino (Italy) allowed a chemotaxonomic distinction to be made between these subspecies.
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Fraternale et al. (1998) studied this question.
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