Marrubium - Synonym. - Horehound. The leaves and tops of

Marrubium vulgare Linne (nat. ord. Labiatae).

Habitat

Europe, Central Asia; naturalized in North America; cultivated.

Characters

Leaves about 25 mm. long, opposite, petiolate, roundish-ovate, obtuse, coarsely crenate, strongly rugose, downy above, white-hairy beneath; branches quadrangular, white, tomentose; flowers in dense, axillary woolly whorls, with a stiffly ten-toothed calyx, a whitish, bilabiate corolla, and four included stamens; aromatic and bitter.

Composition

1) Marrubiin, possibly a glucoside, in crystalline scales or prisms, soluble in Ether, Chloroform and Alcohol. (2) Volatile Oil, in small amount. (3) Resin.

Dose, 1 to 2 dr.; 4. to 8. gm.

Uses and Action of Horehound.

Horehound, used as a decoction or an infusion, is in moderate doses a diuretic, in large doses laxative, and may be so given as to increase the action of the skin and kidneys; but its action is not marked. It is probably also a bitter stomachic. Confection of horehound slowly dissolved in the mouth relieves the relaxed throat of public speakers.