the oils isolated from the aerial parts of ridolfia segetum (l.) moris (apiaceae) gathered in castilla la mancha (spain) were analyzed by capillary gc and gc/ms. the oil from the flowers was dominated by -phellandrene (32.0-33.8%), terpinolene (18.0-21.4%) and (z)--ocimene (12.4-14.5%), while the main components of the fruit oils were found to be dillapiole (5.1-39.6%), -pinene (10.3-20.9%), -pinene (3.0-16.1%), -phellandrene (13.7-15.3%) and (z)--ocimene (8.1-12.8%). the oil from the stems was characterized by a high content of p-cymene (15.1-79.5%), (z)--ocimene(0.9-38.5%) and -phellandrene (1.1-14.4%), whereas the oil from the leaves was shown to contain p-cymene (8.8-83.6%), (z)--ocimene (t-32.6%), myrcene (t-12.5%) and -pinene (2.1-12.1%) as major constituents. (c) 2005, taylor & francis group, llc. all rights reserved.