Volatile constituents of three Compositae herbs:: Anthemis altissima L. var. altissima, Conyza canadensis (L.) Cronq. and Grantina aucheri Boiss.: Growing wild in Iran

Water-distilled essential oils from the leaves and flowers of Anthemis altissima (L.) var.altissima, aerial parts of Conyza canadensis (L.) Cronq. and Grantia aucheri Boiss. were analyzed by GC/MS. beta-Thujone (33.7% and 19.7%, respectively) was found to be the major constituent in the leaf and flower oil of Anthemis altissima. (E)-beta-Farnesene (14.6%), spathulenol (14.1%) and limonene (12.3%) were the prodominant constituents of the oil of Conyza canadensis. The oil of Grantia aucheri comprised mainly sesquiterpenes, of which himachalol (14.9%) was the major constituent.