Lycopus americanus , Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database / USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento.
Lycopus americanus Muhl. ex W.P.C.Barton
* Florae Philadelphicae Prodromus 15. 1815
Lycopus americanus, common names Water horehound or American bugleweed, is a member of the genus Lycopus. It blooms in late summer and is found in much of North America. It is reputed to have medicinal properties and has been used as a dye.
* Niering,W., Olmstead, N., National Audubon Society Guide to North American Wildflowers, Eastern Region,1995, plate 184 and page 573, ISBN 0-394-50432-1
Source: Wikispecies, Wikipedia: All text is available under the terms of the GNU Free Documentation License