FAMILY: Myrtaceae
SYNONYMS: Gum tree, southern blue gum, Tasmanian blue gum, fever tree, stringy bark.
GENERAL DESCRIPTION: A beautiful, tall, evergreen tree, up to 90 metres high. The young trees have bluish-green oval leaves while the mature trees develop long, narrow, yellowish leaves, creamy-white flowers and a smooth, pale grey bark often covered in a white powder.
DISTRIBUTION: Native to Tasmania and Australia. Mainly cultivated in Spain and Portugal, also Brazil, California, Russia and China. Very little of this oil now comes from its native countries.
OTHER SPECIES: There are over 700 different species of eucalyptus, of which at least 500 produce a type of essential oil. Many have been extracted simply for experimental purposes, and research is still being carried out with regard to the different constituents of each oil. In general, they can be divided into three categories. 1. The medicinal oils containing large amounts of cineol (or eucalyptol), such as the blue gum, but increasingly the blue malee (E. polybractea), the narrow-leaved peppermint (E. radiata var. australiana) and the gully gum (E. smithii). 2. The industrial oils containing mainly piperitone and phellandrene, such as the peppermint eucalyptus (E. piperita), grey peppermint (E. radiata var. phellandra) and increasingly the broad-leaved peppermint (E. dives var. Type). 3. The perfumery oils containing mainly citronellal, such as the lemon-scented eucalyptus (E. citriodora). See also Botanical Classification section.
HERBAL/FOLK TRADITION: A traditional household remedy in Australia, the leaves and oil are especially used for respiratory ailments such as bronchitis and croup, and the dried leaves are smoked like tobacco for asthma. It is also used for feverish conditions (malaria, typhoid, cholera, etc.) and skin problems like burns, ulcers and wounds. Aqueous extracts are used for aching joints, bacterial dysentery, ringworms, tuberculosis, etc. and employed for similar reasons in western and eastern medicine. The wood is also used for timber production in Spain.
ACTIONS: Analgesic, antineuralgic, antirheumatic, antiseptic, antispasmodic, antiviral, balsamic, cicatrisant, decongestant, deodorant, depurative, diuretic, expectorant, febrifuge, hypoglycaemic, parasiticide, prophylactic, rubefacient, stimulant, vermifuge, vulnerary.
EXTRACTION: Essential oil by steam distillation from the fresh or partially dried leaves and young twigs.
CHARACTERISTICS: A colourless mobile liquid (yellows on ageing), with a somewhat harsh camphoraceous odour and woody-sweet undertone. It blends well with thyme, rosemary, lavender, marjoram, pine, cedarwood and lemon. (The narrow-leaved eucalyptus (E. radiata var. australiana) is often used in preference to the blue gum in aromatherapy work, being rich in cineol but with a sweeter and less harsh odour.)
PRINCIPAL CONSTITUENTS: Cineol (70–85 per cent), pinene, limonene, cymene, phellandrene, terpinene, aromadendrene, among others.
SAFETY DATA: Externally non-toxic, non-irritant (in dilution), non-sensitizing. ‘When taken internally eucalyptus oil is toxic and as little as 3.5ml has been reported as fatal’..
AROMATHERAPY/HOME: USE
Skin Care: Burns, blisters, cuts, herpes, insect bites, insect repellent, lice, skin infections, wounds.
Circulation Muscles And Joints: Muscular aches and pains, poor circulation, rheumatoid arthritis, sprains, etc.
Respiratory System: Asthma, bronchitis, catarrh, coughs, sinusitis, throat infections.
Genito-Urinary System: Cystitis, leucorrhoea.
Immune System: Chickenpox, colds, epidemics, ’flu, measles.
Nervous System: Debility, headaches, neuralgia.
OTHER USES: The oil and cineol are largely employed in the preparation of liniments, inhalants, cough syrups, ointments, toothpaste and as pharmaceutical flavourings also used in veterinary practise and dentistry. Used as a fragrance component in soaps, detergents and toiletries – little used in perfumes. Used for the isolation of cineol and employed as a flavour ingredient in most major food categories.
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