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Montana Field Guides

Common Horehound - Marrubium vulgare
Other Names:  White Horehound

Non-native Species

Global Rank: GNR
State Rank: SNA
C-value: 0

Agency Status


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 et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


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

Observations in Montana Natural Heritage Program Database
Number of Observations: 21

(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)



  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Chadde, S.W. 1985. Initial recovery patterns of southwestern Montana foothill range. M.Sc. Thesis. Bozeman, MT: Montana State University. 103 p.
    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
    • Quire, R.L. 2013. The sagebrush steppe of Montana and southeastern Idaho shows evidence of high native plant diversity, stability, and resistance to the detrimental effects of nonnative plant species. M.Sc. Thesis. Bozeman, MT: Montana State University. 124 p.
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Citation for data on this website:
Common Horehound — Marrubium vulgare.  Montana Field Guide.  .  Retrieved on , from