FAMILY: Betulaceae
SYNONYMS: B. alba var. pubescens, B. odorata, B. pendula, European white birch, silver birch.
GENERAL DESCRIPTION: Decorative tree, up to 15–20 metres high, with slender branches, silvery-white bark broken into scales, and light green oval leaves. The male catkins are 2–5 cms long, the female up to 15 cms long.
DISTRIBUTION: Native to the northern hemisphere; found throughout Eastern Europe, Russia, Germany, Sweden, Finland, the Baltic coast, northern China and Japan.
OTHER SPECIES: Many cultivars exist of this species of birch. The paper birch (B. papyrifera) and B. verrucosa are also used for the production of birch bud oil and/or birch tar. NB Should not be confused with the oil from the sweet birch (B. lenta) which is potentially toxic.
HERBAL/FOLK TRADITION: Birch buds were formerly used as a tonic in hair preparations. Birch tar is used in Europe for all types of chronic skin complaints: psoriasis, eczema, etc. In Scandinavia the young birch leaflets and twigs are bound into bundles and used in the sauna to tone the skin and promote the circulation. The sap is also tapped in the spring and drunk as a tonic. Buds, leaves and bark are used for ‘rheumatic and arthritic conditions, especially where kidney functions appear to need support … oedematous states; urinary infections and calculi.’.
ACTIONS: Anti-inflammatory, antiseptic, cholagogue, diaphoretic, diuretic, febrifuge, tonic.
EXTRACTION: 1. Essential oil by steam distillation from the leaf-buds. 2. Crude birch tar is extracted by slow destructive distillation from the bark; this is subsequently steam distilled to yield a rectified birch tar oil.
CHARACTERISTICS: 1. Pale yellow, viscous oil with a woody-green balsamic scent. It crystallizes at low temperatures. 2. The crude tar is an almost black, thick oily mass. The rectified oil is a brownish-yellow, clear oily liquid with a smoky, tar-like, ‘Russian leather’ odour. It blends well with other woody and balsamic oils.
PRINCIPAL CONSTITUENTS: 1. Mainly betulenol and other sesquiterpenes. 2. In the tar oil: phenol, cresol, xylenol, guaiacol, creosol, pyrocatechol, pyrobetulin (which gives the ‘leather’ scent).
SAFETY DATA: Non-toxic, non-irritant, non-sensitizing.
AROMATHERAPY/HOME: USE
Skin Care: Dermatitis, dull or congested skin, eczema, hair care, psoriasis etc.
Circulation Muscles And Joints: Accumulation of toxins, arthritis, cellulitis, muscular pain, obesity, oedema, poor circulation, rheumatism.
OTHER USES: Birch bud oil is used primarily in hair tonics and shampoos, and in some cosmetics for its potential skin-healing effects. The crude tar is used in pharmaceutical preparations, ointments, lotions, etc. for dermatological diseases. It is also used in soap and leather manufacture – rectified birch tar oil provides the heart for many ‘leather’ type perfumes and aftershaves.