GC-MS analysis of the volatile constituents of Royle, ex Benth.

The hydro-distilled essential oil from aerial parts of Royle, ex Benth (Lamiaceae) was investigated by using gas chromatography equipped with a flame ionisation detector (GC-FID) and gas chromatography coupled with a mass spectrometry (GC-MS). Fifty-two compounds, representing 98.4% of the total oil constituents, were identified. The major constituents were -caryophyllene (17.4%) and 7---selinene (15.2%). The other minor constituents were terpinolene (6.9%), -pinene (6.8%), -elemene (5.1%), -humulene (4.9%), -copaene (4.8%), -cubebol (4.5%) and zonarene (3.9%). The oil was found to be rich in sesquiterpene hydrocarbon type constituents. Lamiaceae[Formula: see text].