Abstract The essential oils of Origanum elongatum Emberger et Maire grown from seeds from Morocco, harvested at a natural site and in the CNPPMAI collection were analyzed by GC/MS; 67 constituents were identifed, among which carvacrol predominated (> 65%), accompanied by Î³-terpinene, p-cymene and linalool in small amounts. Two samples were unusually thymol-rich (â 15% versus < 1.5% in the other extracts, with carvacrol 55â64%). Key Word Index: Origanum elongatum Lamiaceaeessential oil compositionthymolcarvacrol