Monday, March 16, 2009

Eucalyptus citriodora Hook.

English Name : Lemon-scented gum, Spotted gum, Lemon-scented iron gum

Family : Myrtaceae

Origin : Australia - Queensland.

A medium to large, often straight stemmed tree, 25—40(—50) m tall, of handsome appearance, with pale grey, cream or pink powdery bark, smooth throughout, decorticating in flakes, and somewhat sparse foliage. Twigs slender, slightly flattened, light green, tinged with brown. Leaves petiolate, strongly lemon-scented when crushed; seedling leaves opposite for a few pairs then alternate, peltate, ovate, 6.5—17 cm x 2.3—7.5 cm, pale green, slightly discolorous, setose. Inflorescence an umbelliform condensed and reduced dichasium (usually called a conflorescence), combined into clustered terminal or sometimes axillary, corymbose panicles; peduncle terete, 3—8 mm long; umbels 3-flowered; pedicel 1—6 mm long; buds pedicellate, clavate, up to 10 mm x 6 mm, scar absent; operculum hemispherical, 3—4 mm long, 4—5 mm wide, apiculate. Flowers creamy-white; hypanthium hemispherical, 5—6 mm x 4—5 mm; stamens numerous, prominent, 6 mm long, spreading 12 mm across, all fertile with subulate filaments and oblong, dorsifixed anthers dehiscing by parallel slits; pistil inferior with 3-celled ovary. Fruit a capsule, truncate-ovoid to urceolate, 8—15 mm x 7—11 mm, brown, often warty, 3-locular; disk about 2 mm wide. Seed dorsiventrally compressed, 2—3 mm x 1.5—2.5 mm, glossy red-brown, with a median dorsal keel.

Usually found in heavy soils, but also succeeding on deep sandy loams in coastal regions.

Parts Used : Leaf essential oil and resin from the trunk

Herb Effects
Acts as a powerful antiseptic, disinfectant and antibacterial (leaf essential oil).

Medicinal Use
Used for relieving coughs and colds, sore throats, influenza, cuts, ulcers, wounds and skin infections, and inhaled for treating blocked nasal passages (leaf essential oil); used internally in the treatment of diarrhoea and bladder inflammation, and externally applied to cuts (resin from the trunk).


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