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The volatile oil of Thymus kotschyanun in Turkey (1) and Armenia (2) has been examined previously. The essential oil of T. kotschyanus is non-toxic to mice, rabbits and guinea pigs (LD59= 1000±1200mg/kg)(3). T. kotschyanus is used as an anthelmintic, antispasmodic, carminative, sedative, diaphoretic, usually in the form of an infusion (4, 5). A literature survey has shown that T. pubescens and T. carmanicus were not previously investigated for essential oils. In folk medicine both species are used externally in baths to cure rheumatic and skin disease (4).

Thymus kotschyanus was collected from Dizin, 30 km north of Tehran, T. pubescens from Emarloo in Guillan and T. carmanicus from Yazd in June to July 1997. Voucher specimens (No. 7624, 7628 and 7617) were deposited in the Herbarium of the Department of Botany, Shaheed Beheshti University, Tehran. The plant material (180g each) was dried at room …