The essential oils with dominant germacrene D of Hypericum perforatum L. growing wild in Lithuania

The oil-poor Hypericum perforatum plants were collected at full flowering from ten wild habitats in Lithuania. The essential oils obtained by hydrodistillation were analyzed by GC and GC/MS. The most predominant compound was germacrene D (12.0-29.5%). The second major constituents were beta-caryophyllene (8.8-10.5%, three oils), caryophyllene oxide (11.9-13. 1 %, two samples), beta-eudesma-4(15),5-dien-1-ol. (9.1-11.7 %, two oils), beta-farnesene (9.0%, one sample) and tetradecanal (9.4%) with tetradecanol (9.4%, one oil). The oils were rich in sesquiterpene hydrocarbons (31.8-52.4%). Thirty-one out of the eighty identified constituents were found in the all oils. The identified compounds comprised 87.5-95.6% of the oils.