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The composition of the essential oils of the Hypericum perforatum L., Hypericum tetrapterum Fries and Hypericum olympicum L. is reported. GC-MS analyses showed α-pinene (21.0%) and 2-methyl-octane (12.6%) as the most abundant components of H. perforatum, whilst α-copaene (11.3%) and α-longipinene (9.7%) were the major constituents of H. tetrapterum; those of H. olympicum oil were germacrene D (16.0%) and (E)-caryophyllene (7.4%).
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Pavlović et al. (2005) studied this question.
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