Abstract The essential oil from the leaves of Eupatorium triplinerve was analyzed by GC, GC/MS, IR and NMR. Nineteen compounds representing 82% of the oil were identified. The major components were selina-4(15), 7(11)-dien-8-one (36.6%), Î²-caryophyllene (14.7%) and Î´-elemene (5.9%). Key Word Index: Eupatorium triplinerve Compositaeessential oil compositionselina-4(15)7(11)-dien-8-oneÎ²-caryophyllene