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The genus Onosma L. (Boraginaceae) is represented in Turkey by 105 species (110 taxa), 53 of them and 1 variety are endemic for Turkey. Some species of Onosma are used as herbs, traditional medicine such as against burns, wounds and ailments (4,5). Hydrodistilled essential oils of the aerial parts of Onosma isaurica Boiss. & Heldr. And Onosma bulbotrichum DC. were analyzed by GC and GC-MS systems, simultaneously. The oil of O. isaurica contained hexahydrofarnesyl acetone (20.3%), phytol (19.0%), farnesyl acetone (8.1%) and neophytadiene isomer I/Tetradecanal (7.0%).as main constituents. The oil of O. bulbotrichum was characterized by the occurrence of hexahydrofarnesyl acetone (11.6%), farnesyl acetone (9.9%), hexadecanal (8.8%) E-geranyl acetone (7.4%) and neophytadiene isomer I (7.3%) as major components.

WOS: 000435102100003, The composition of the essential oil produced from aerial parts of Salvia montbretii Benth.(Lamiaceae), was analyzed by GC and GC-MS. Forty-six compounds constituting about 97.7% of the essential oil were characterized. The main compounds were characterized as beta-caryophyllene (32.8%), beta-pinene (9.8%), alpha-humulene (8.2%), 12-hydroxy-beta-caryophyllene acetate (6.6%), germacrene D (4.9%) and alpha-pinene (4.5%).

The genus Scutellaria L. (Lamiaceae) is represented in Turkey by 16 species, 1 natural hybrid, 38 taxa, 16 being endemic in Turkey (1,2). Hydrodistilled essential oils of the aerial parts of Scutellaria altissima L. and Scutellaria orientalis L. subsp. pinnatifida Edmondson were analyzed by GC and GC-MS systems, simultaneously. The oil of S. altissima contained β-caryophyllene (34.7 %), caryophyll-5-en-12-al (14.4%), linalool (14.3%) and hexadecanoic acid (7.1%) as main constituents. The oil of S. orientalis L. subsp. pinnatifida was characterized by the occurrence of germacrene D (56.9%), β-caryophyllene (10.5%) and bicyclogermacrene (10.1%) as major components. To the best of our knowledge, this is the first report on the GC and GC/MS determination of the essential oil composition of the S. altissima and S. orientalis subsp. pinnatifida species studied.