Sweet Orange (fruit of the Citrus sinensis tree) is not the same as Bitter Orange (fruit of the Citrus aurantium tree). Native to China, Sweet Orange was brought to Europe by Portuguese sailors in the 16th century. Its light, fruity and sweet fragrance delicately perfumes the air. A must fragrance in your aromatherapy starter kitâ€¦ Sweet orange essential oil is used in aromatherapy for its sedative properties in relieving symptoms associated with mild anxiety, nervousness and insomnia. Size: 15 ml.