Marrubium vulgare (L) Synonyms and Common names: Harhound,
Hoarhound, common hoarhound German = Maurerandorn, French =
Marrube blanc, Italian = Marrobio bianco, Spanish = Marrubio
Description: Marrubium is an erect mint-like plant, indigenous
to Britain and widely distributed over Europe, central and
northern Asia, and scattered throughout North America. It is
densely covered in white fur, has a thick stem, and grows up to
60cm. The circular to broadly ovate wrinkled leaves, 15-40mm
long, are bluntly toothed at the margins. The upper surface is
greyish and less hairy than the lower surface. Dense whorls of
off-white flowers, about 15mm long, are found in the axils of
paired, leaf-like bracts The calyx tube has ten tiny hooked
teeth at the rim. Marrubium flowers between April and October
and inhabits roadsides and waste places. Parts used: Dried
leaves and flowering tops Collection: During the flowering
period between June and September. Constituents: Sesquiterpene
bitters (including marrubiin), Diterpene alco