The hydro-distilled essential of the aerial parts of blue flowered ‘rosemary’ (Rosmarinus officinalis L.), grown in Kumaon region of western Himalaya was investigated in different seasons viz. spring, summer, rain, autumn and winter by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). A total 37 components accounting for 90.21%-94.72% of the oil were identified. The major components of the oils were α-pinene (13.41%-16.03%), camphor (12.54%-17.72%), 1,8-cineole (5.85%-11.18%), α-terpineol + borneol (13.32%-19.07%), verbenone (3.03%-6.54%), and bornyl acetate (0.60%-6.49%) in different seasons. The α-pinene, camphor, and 1, 8-cineole were observed to be higher in winter, spring, and autumn seasons, respectively
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