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The taxa of Otacanthus were found to contain between 0.007 and 0.2% of essential oils, that consist of monoterpenoids and sesquiterpenoids. Their composition provided additional data for classification, especially of intermediate taxa that are difficult to classify on purely morphological grounds. Ten taxa of Otacanthus were found to contain essential oils ranging from 0.007 to 0.2% of fresh weight, that consisted of monoterpenoids and sesquiterpenoids. Their composition was submitted to principal component analysis and cluster analysis. This provided additional data for the classification of the taxa, especially for the position of intermediate taxa that are difficult to classify on purely morphological grounds. |
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