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Abstract
The composition of the essential oil from Leonurus glaucescens growing wild in Northern Kazakhstan was analyzed by the method of GC-MS. The main natural constituents of L. glaucescens essential oil were germacrene D (15.8-27.5%), α-pinene (6.0-13.0%), (E)-β-caryophyllene (4.7-9.3%), α-humulene (3.7-8.8%), cis-β-ocimene (2.3-6.5%), depending on the places of growth. Hierarchical cluster analysis, based on the composition of 10 different essentials oils from Leonurus species, showed that composition of L. glaucescens, growing in Northern Kazakhstan, is similar to L. cardiaca, growing in Lithuania. Sesquiterpene hydrocarbons-(E)-β-caryophyllene, germacrene D and á-humulene are the predominant components of the essential oils of the genus Leonurus.