Abstract The oil constituents of four populations of Cachrys trifida L. have been studied by GC and GC/MS. The main components of the flower oil were found to be γ-terpinene (32.4â38.8%), (E)-β-ocimene (27.3â36.8%), limonene (6.0â24.2%) and p-cymene (7.2â7.4%), whereas the major compounds from the fruit oil were γ-terpinene (28.3â37.3%), limonene (14.2â34.5%), p-cymene (14.1â24.5%), α-pinene (3.8â11.3%) and (Z)-β-ocimene (3.0â8.0%). The oil from the stems and leaves was characterized by a high amount of (E)-β-ocimene (61.0â70.7%), (Z)-β-ocimene (20.4â51.5%) and γ-terpinene (3.8â8.5%). Finally the root oil contained high amounts of terpinolene (61.8â70.7%), γ-terpinene (8.2â13.6%) and p-cymene (8.0â10.9%).