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Montana Field Guide

Montana Field Guides

Common Horehound - Marrubium vulgare
Other Names:  White Horehound

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 0

External Links

General Description
Taprooted perennial. Stems ascending to erect, simple, 30–100 cm. Herbage white-wooly. Leaves cauline, short-petiolate; blades ovate, crenate, 1–3 cm long. Inflorescence of dense, head-like verticillasters in leaf axils. Flowers: calyx 4–6 mm long, wooly with long hairs within the throat, the 10 hooked-spinulose teeth shorter than the campanulate tube; corolla white, 5–7 mm long, bilabiate, the 2 lips ca. equal in length; stamens 4. Nutlets minutely reticulate (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
Sporadically introduced throughout North America; native to Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 12

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)


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Citation for data on this website:
Common Horehound — Marrubium vulgare.  Montana Field Guide.  .  Retrieved on , from