The essential oils obtained from Origanum glandulosum Desf., collected from two different localities of north-eastern Algeria, Constantine and Jijel, and from O. syriacum var. syriacum grown at El-Aghwar (northern Jordan) and El-Shubak (southern Jordan), were analyzed by GC-MS. p-Cymene (6.6% and 7.5%) and γ-terpinene (13.4% and 14.5%) were found in O. glandulosum grown at Constantine and Jijel, respectively, in addition to the major components thymol (34.2%, 51.1%) and carvacrol (30.5%, 6.8%). The oil of O. syriacum L. var syriacum (Boiss.) Ietswaart from El-Shubak was mainly represented by thymol (51.8%) and carvacrol (34.4%), while the oil from El-Aghwar was a thymol-chemotype (72.4%), along with γ-terpinene (7.8%) and p-cymene (5.4%).
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