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Horehound (Marrubium vulgare)
Shrubs Around Las Vegas, Vegetation Around Las Vegas
Horehound (Marrubium vulgare)

General: Horehound (Marrubium vulgare) is an exotic shrub introduced into this country from Europe. It is now widespread, but it isn't too invasive.

The shrub grows upright to spreading with round, crinkly leaves. The flowers are in ball-like clusters in the leaf axils, and when dried, persist on the plant. The stems are square in cross-section.

Horehound is an uncommon component of vegetation communities in dry, well-drained sandy and gravelly areas on desert flats, bajadas, and moderate slopes in the lower mountains in the Lower Sonoran (Creosote-Bursage Flats) and Upper Sonoran (Mojave Desert Scrub) life zones.

Horehound (Marrubium vulgare)

Family: Mint (Lamiaceae).

Other Names:

Plant Form: Upright, spreading shrub.

Height: To about 2 feet.

Horehound (Marrubium vulgare)
Roundish, crinkly leaves.

Stems: Upright, spreading, square.

Leaves: Roundish, crenate, toothed.

Flowers: Inflorescence axillary. Flowers in clusters. Corolla white, two lipped, upper lip two lobed, lower lip three lobed.

Seeds: Nutlet.

Horehound (Marrubium vulgare)
Flower clusters in leaf axils.

Habitat: Disturbed and overgrazed sites in Creosote-Bursage Flats, desert canyons, and lower desert mountains.

Elevation: To about 2,000 feet.

Distribution: Worldwide, but desert mountains around Las Vegas.

Comments: This is an exotic species that should be removed when found.

Horehound (Marrubium vulgare)
Flowers white, lobed, and growing in clusters
Horehound (Marrubium vulgare)
Flowers lobed: upper lip two-lobed, lower lip three-lobed
Horehound (Marrubium vulgare)
Dried flower clusters persist
Horehound (Marrubium vulgare)
Flower clusters in ball-like ornaments along the stem

Note: All distances, elevations, and other facts are approximate. Names generally follow the USDA database.
copyright; Last updated 141119

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