American water horehound

Prepared by Jennifer L. D’Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. Updated February 2018.

Scientific name: Lycopus americanus  Muhl. ex W. Bartram

Common name(s): American water horehound, water horehound, American bugleweed

Link(s): USDA PLANTS Profile , NPIN Profile, Go Botany

Images: (to see enlargements [PC]: click on image, then right click and choose “view image”)


– perennial

-simple opposite leaves

-largely toothed leaves with deep lobes

-high fire tolerance

– may be confused with L. uniflorus (has tubers) or L. virginicus (no tubers), but only in wet areas; see left sidebar on Go Botany webpage.





-shade tolerant

Natural History:

-can be used as a analgesic or gastro-intestinal aid



Go Botany. “Lycopus Americanus Muhl. Ex W. Bart.” Lycopus Americanus (American Water-Horehound): Go Botany, 2020,

Natural REsource Conservation Service. “Conservation Plant Characteristics for ScientificName (CommonName): USDA PLANTS.” Conservation Plant Characteristics for ScientificName (CommonName) | USDA PLANTS, USDA, 2021,