abstract the volatile oils of the different aerial parts of ridolfia segetum (l.) moris (apiaceae) gathered in andalucia (spain) were analyzed by capillary gc and gc/ms. the oil from the stems was characterized by a high content of -phellandrene (39.4-62.0%), p-cymene (10.4-22.7%), (z)--ocimene (10.2-11.7%) and terpinolene (7.0-15.6%), whereas the leaf oil was shown to contain -phellandrene (61.8%-69.5%), (z)--ocimene (10.7-12.0%) and terpinolene (6.0-10.7%) as major constituents. the flower oil was also dominated by -phellandrene (44.5-54.7%), (z)--ocimene (8.5-10.6%) and terpinolene (20.1-27.6%), while the main components of the fruit oils were found to be -pinene (1.5-11.9%), -phellandrene (5.2-56.9%), p-cymene (4.2-25.2%), -phellandrene (0.9-15.6%), terpinolene (4.3-12.5%) and dillapiole (0.1-45.7%).