FAMILY: Rutaceae
SYNONYMS: C. vulgaris, C. bigaradia, Seville orange, sour orange bigarade (oil).
GENERAL DESCRIPTION: An evergreen tree up to 10 metres high with dark green, glossy, oval leaves, paler beneath, with long but not very sharp spines. It has a smooth greyish trunk and branches, and very fragrant white flowers. The fruits are smaller and darker than the sweet orange. It is well known for its resistance to disease and is often used as root stock for other citrus trees, including the sweet orange.
DISTRIBUTION: Native to the Far East, especially India and China, but has become well adapted to the Mediterranean climate. It also grows abundantly in the USA (California), Israel and South America. Main producers of the oil include Spain, Guinea, the West Indies, Italy, Brazil and the USA.
OTHER SPECIES: There are numerous different species according to location – oils from Spain and Guinea are said to be of superior quality.
HERBAL/FOLK TRADITION: ‘Oranges and lemons strengthen the heart, are good for diminishing the coagubility of the blood, and are beneficial for palpitation, scurvy, jaundice, bleedings, heartburn, relaxed throat, etc. They are powerfully anti-scorbutic, either internally or externally applied.’. The dried bitter orange peel is used as a tonic and carminative in treating dyspepsia.
In Chinese medicine the dried bitter orange and occasionally its peel are used in treating prolapse of the uterus and of the anus, diarrhoea, and blood in the faeces. Ingestion of large amounts of orange peel in children, however, has been reported to cause toxic effects.
ACTIONS: Anti-inflammatory, antiseptic, astringent, bactericidal, carminative, choleretic, fungicidal, sedative (mild), stomachic, tonic.
EXTRACTION: An essential oil by cold expression (hand or machine pressing) from the outer peel of the almost ripe fruit. (A terpeneless oil is also produced.) The leaves are used for the production of petitgrain oil; the blossom for neroli oil.
CHARACTERISTICS: A dark yellow or brownish-yellow mobile liquid with a fresh, dry, almost floral odour with a rich, sweet undertone.
PRINCIPAL CONSTITUENTS: Over 90 per cent monoterpenes: mainly limonene, myrcene, camphene, pinene, ocimene, cymene, and small amounts of alcohols, aldehydes and ketones.
SAFETY DATA: Phototoxic; otherwise generally non-toxic, non-irritant and non sensitizing. Limonene has been reported to cause contact dermatitis in some individuals.
AROMATHERAPY/HOME: USE See sweet orange.
OTHER USES: Used in certain stomachic, laxative and carminative preparations. Employed as a fragrance component in soaps, detergents, cosmetics, colognes and perfumes. Extensively used as a flavouring material, especially in liqueurs and soft drinks. Also utilized as a starting material for the isolation of naturallimonene.