Lycopus europaeus
- Two photographs of Gipsywort and some identifying features.
- http://www.plant-identification.co.uk/skye/labiatae/lycopus-europaeus.htm

Lycopus europaeus (Gypsywort)
- Photos of habit, leaf, flower, and fruit.
- http://www.kuleuven-kortrijk.be/bioweb/?lang=en&detail=234&titel=Lycopus%20europaeus%20%20%20%20%20%20%20%20%20%20-%20gypsywort

Water Horehound (Lycopus americanus)
- image and horticultural data
- http://www.ct-botanical-society.org/galleries/lycopusamer.html

Pollen Morphology of the Genus Lycopus (Lamiaceae)
- journal article
- http://www.sekj.org/PDF/anb40-free/anb40-191.pdf

Lycopus ramosissimus
- photo
- http://www.healer.pe.kr/flora/lycopus_ramosissimus.jpg

Lycopus uniflorus (Northern Bugleweed)
- photo
- http://www.delawarewildflowers.org/1220.html

Lycopus virginicus
- photo
- http://outingclub.wlu.edu/guidebook/wildflowers/flowers/Lycopus_virginicus.jpg

Lycopus virginicus (Bugleweed)
- short description and medicinal uses
- http://www.botanical.com/botanical/mgmh/b/buglew84.html