abstract through a combination of gc and gc/ms, we studied the origanum bastetanum soc. essential oil obtained from the aerial parts submitted to three different cut-off heights of three-year-old plants, established from micropropagated specimens. over 80 components were identified, the major ones, in all cases, being -terpinene (32.0-37.0%), thymol (29.5-31.6%), p-cymene (7.0-8.8%) and -caryophyllene (5.0-6.9%). therefore, this spanish origanum species can be classified as belonging to the terpenphenolic oregano group, in contrast to the wild specimens, the main component of which is cis-sabinene hydrate (cis-thujanol).