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 α-phellandrene (39.4â62.0%), p-cymene (10.4â22.7%), (Z)-β-ocimene (10.2â11.7%) and terpinolene (7.0â15.6%), whereas the leaf oil was shown to contain α-phellandrene (61.8%-69.5%), (Z)-β-ocimene (10.7â12.0%) and terpinolene (6.0â10.7%) as major constituents. The flower oil was also dominated by α-phellandrene (44.5â54.7%), (Z)-β-ocimene (8.5â10.6%) and terpinolene (20.1â27.6%), while the main components of the fruit oils were found to be β-pinene (1.5â11.9%), α-phellandrene (5.2â56.9%), p-cymene (4.2â25.2%), β-phellandrene (0.9â15.6%), terpinolene (4.3â12.5%) and dillapiole (0.1â45.7%).