Heracleum siamicum Craib (Apiaceae) is an important herbal spices having a wide applications in flavoring processed foods. The flat-oval shaped fruit of H. siamicum Craib from North Thailand was hydrodistilled and chemical composition of the essential oil was analyzed by GC and GC-MS. The essential oil yield based on dried plant material was 1.25% and twenty-five compounds (corresponding to 97....
