Lycopus rubellus (stalked water-horehound): Go Botany
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SEINet Portal Network - Lycopus americanus
Lycopus europaeus - Wikipedia
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Lycopus uniflorus - Wikispecies
Consortium of Midwest Herbaria - Lycopus europaeus
Genus: Lycopus (water-horehound): Go Botany
Species Profile - Lycopus asper
Species Profile - Lycopus europaeus
Lycopus americanus
Plants of Louisiana
Lycopus americanus (American Water Horehound): Minnesota Wildflowers
Lycopus europaeus Gypsywort PFAF Plant Database
Lycopus americanus page
Lycopus americanus Water Horehound | Prairie Moon Nursery
Chinese Bugleweed (Lycopus lucidus) - Cultivariable
Lycopus virginicus - Wikipedia
Vascular Plants of the Gila Wilderness-- Lycopus americanus
Amazon.com : Lycopus europaeus, Gypsywort Starter Plant (10 Plants) : Patio, Lawn & Garden
US Wildflower - Northern Bugleweed, Northern Water Horehound - Lycopus uniflorus
Water Horehounds - Lycopus SPP.: Edible & Medicinal Uses of the Culvert Mint of Wild Plants - Song of the Woods
