The essential oil of Erigeron canadensis L ( family: Asteraceae) extracted by hydrodistillation was analyzed by GC and GC-MS
techniques. A total of 23 components were identified, representing 95.9 % of the oil. The main constituents were monoterpenoids (
limomene ( 57.2% ), camphene ( 2.5% ) ? and ?-pinenes ( 1.9 % & 2.1% ) and sesquiterpenoids (caryophyllene ( 6.7%), germacrene
D ( 4.9%) and ?-curcumene ( 3.0% ). A few non-terpenoid acetylenic compounds (4.8%) were also detected.