the oil of a.ludoviciana was also characterized by a high content of oxygenated sesquiterpenes with a 5-ethenyltetrahydro-5-methyl-2-furanyl moiety,of which davanone(11.5)was the main component identified.a.absinthium oil was characterized by high amounts of myrcene(10.8),trans-thujone (10.1)and trans-sabinyl acetate (26.4)a.biennis yielded an oil rich in (Z)-beta-ocimene (34.7),(E)-beta-farnesene (40.0)and the acetylenes (11.0)(Z)-and (E)-en-yn-dicycloe-thers.