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Lycopus americanus page
http://www.hawriverprogram.org/NCPlants/Lycopus_americanus_page.html
Photo closeups of Lycopus americanus
Lycopus europaeus
http://www.kulak.ac.be/facult/wet/biologie/pb/kulakbiocampus/lage%20planten/Lycopus%20europaeus%20-%
photo
Lycopus lucidus
http://www.ibiblio.org/herbmed/pictures/p08/pages/lycopus-lucidus-1.htm
photo
Lycopus ramosissimus
http://www.healer.pe.kr/flora/lycopus_ramosissimus.jpg
photo
Lycopus uniflorus (Northern Bugleweed)
http://www.delawarewildflowers.org/1220.html
photo
Lycopus virginicus
http://outingclub.wlu.edu/guidebook/wildflowers/flowers/Lycopus_virginicus.jpg
photo
Lycopus virginicus (Bugleweed)
http://www.botanical.com/botanical/mgmh/b/buglew84.html
short description and medicinal uses
Plant Profile - Lycopus europaeus
http://plants.usda.gov/cgi_bin/topics.cgi?earl=plant_profile.cgi&symbol=LYEU
illustration, horticultural data, and distribution in the U.S.
Plant profile - Lycopus rubellus
http://plants.usda.gov/cgi_bin/topics.cgi?earl=plant_profile.cgi&symbol=LYRU
photo and distribution in the U.S.
Pollen Morphology of the Genus Lycopus (Lamiaceae)
http://www.sekj.org/PDF/anb40-free/anb40-191.pdf
journal article