Photo: Lycopus americanus 4.

Flowering tops. Botanical garden Kaisaniemi, Helsinki, Finland. Planted. 2004-08-24.

Lycopus americanus Muhl. ex W. Bart.
Engl.: American water horehound, bugleweed.
Bot. syn.: Lycopus heterophyllus Raf., Lycopus longifolius Raf., Lycopus pauciflorus Raf., Lycopus sinuatus Ell.