In this work, hydrodistilled essen tial oils from crushed dry flowers, stems, and roots of Salvia multicaulis Vahl. (Lamiaceae) from Semnan province (Iran) were studied by GC and GC/MS [9]. The air-dried flowers, stems, and roots of the plant yielded 0.38, 0.29, and 0.18% (w/w) yellowish colored oil, respectively. The percentage composition of the flower, stem, and root oil of S. multicaulis is given in Table 1. Twenty-one constituents (94.28%) were identified in flower oil: seven monoterpene hydrocarbons (33.73%), five oxygenated monoterpenes (47.79%), eight sesquiterpene hydrocarbons (12.54%), and one oxygenated sesquiterpene (0.22%). 1,8-Cineol was the most abundant constituent (25.27%), followed by α-pinene (18.32%), camphor (12.40%), camphene (8.45%), and bornyl acetate (7.89%). Eight constituents (98.05%) were identified in stem oil: three monoterpene hydrocarbons (36.9%) and five oxygenated monoterpenes (61.15%). In this oil we could not find any trace of sesquiterpenes. It was characterized by a higher amount of 1,8-cineol (24.83%), camphor (24.20%), α-pinene (20.91%), and camphene (13.03%). Nine compounds (95.37%) were identified in root oil: two monoterpene hydrocarbons (10.96%), four oxygenated monoterpenes (75.43%), two sesquiterpene hydrocarbons (5.56%), and one oxygenated sesquiterpene (3.66%). It was characterized by the presence of higher amounts of borneol (48.75%), followed by camphor (17.17%), 1,8-cineol (7.96%), and α-pinene (6.59%). In this oil oxygenated monoterpenes predominated over monoterpene hydrocarbons and sesquiterpenes. According to the above-mentioned infor mation, the flower and root oils were characterized by large amounts of monoterpenes (81.52 and 86.39%, respectively) while the constituents of stem oil were only monoterpenes (98.05%). A comparison of the chemical composition of Salvia multicaulis with previous published reports reveals that bornyl acetate (18.1%), β-caryophyllene (16.5%), and α-pinene (15.6%) were the major constituents of the flowering shoots [10], while the main constituents of the oil from leaves and flowers [11] were α-pinene (26.0%), 1,8-cineol + limonene (20.0%), and camphor (19.0%); on the other hand, the main components of the oil from aerial parts [12] were α-copaene (8.0%), α-pinene (6.6%), myrtenol (5.7%), and sabinyl acetate (5.3%); other reports on the oil of flowering aerial parts [13] showed that the ma in components were camphor (11.0%), 1,8-cineol (10.7%), borneol (8.6%), and α-pinene (7.5%). To the best of our knowledge, this is the first report on the essential oils of the stem and root of Salvia multicaulis