Citrus aurantium oil is commonly used in aromatherapy. Bitter orange (C. aurantium) is derived from a small shrub that typically reaches to 3–4 meters in height and grows in the northern and southern areas of Iran. The flowers grow in isolation or in groups, dispersed on the branches. The flowers are scented with thick, juicy petals in yellowish white. On the surface of the leaves there are very small openings called stomata that can easily be seen; these can act as exit pathways for the plant’s essential oil (18, 19).