Mentha arvensis L | Hang Xanh

SPECIFICATION

Description: Perennial herb, 30-50cm. high, usually withered in winter. Stems quadrangular, erect or prostrate, rooting at the nodes. Leaves opposite, ovate, softly tomentose on both sides; margins serrate. Inflorescence in axillary capitate whorl; flowers small, white or lilac. All parts of the plant are aromatic.

Flowering period: June - September.

Parts used: The whole plant, apart from the roots, is harvested before flowering, when the weather is dry. The plants are used fresh or dried in the shade or in ovens at low temperature. An essential oil can be obtained from the leaves by distillation.

Therapeutic uses: The entire plant, apart from the roots, is antibacterial and antifebrile. It yields an essential oil and menthol which exert, through their rapid evaporation, a slightly anaesthetic and anodyne local effect. It is effective in coryza, adiaphoretic fever, headache, rhinitis, cough, sore throat, arthralgia, neuralgia, colic, vomiting, dyspepsia, diarrhoea and prurigo.

The normal daily dose is 12 to 20g in the form of a decoction or infusion. The essential oil and menthol are the constituents of several balsams. Poultices of fresh leaves and the inhalation of essential oil and menthol are also prescribed

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