E-Flora BC: Electronic Atlas of the Flora of British Columbia

Marrubium vulgare L.
common horehound (horehound)
Lamiaceae (Mint family)

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #20808)

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Distribution of Marrubium vulgare
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Species Information

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General:
Perennial herb from a stout taproot, white-woolly; stems ascending, 30-100 cm long, 4-angled, generally several; thyme-scented, cultivated for tea, flavouring.
Leaves:
Opposite, round to broadly egg-shaped, 2-5.5 cm long, about as wide, bases lobed to round, tips blunt, green and wrinkled above, white-woolly below, margins blunt-toothed; lower long-, upper short-stalked; uppermost leaves not much reduced.
Flowers:
Inflorescence of broad, many-flowered axillary clusters; corollas tubular, whitish, 8-15 mm long, slightly exserted from calyces, lips 2, about equal, the upper lip erect and narrowly 2-lobed, the lower lip spreading with broadly rounded central lobe; calyces star-shaped with ring of long hairs in throat, soft-hairy, the tube 4-5 mm long, the teeth 10, narrow, eventually widely spreading, sometimes unequal, tips spine-hooked.
Fruits:
Nutlets, 4 clustered together, egg-shaped, smooth.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry disturbed sites in the lowland and lower montane zones; frequent in C and S BC; introduced from Eurasia.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

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General References