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Vervain ''Verbena simplex'' - USGS photo [http://www.pwrc.usgs.gov/history/herbarium/verbena_simplex.htm] {{PD-USGov-Interior-USGS}} http://en.wikipedia.org/wiki/Image:Verbena_simplex.jpg
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![EnvoyVervain ''Verbena simplex'' - USGS photo [http://www.pwrc.usgs.gov/history/herbarium/verbena_simplex.htm] {{PD-USGov-Interior-USGS}} http://en.wikipedia.org/wiki/Image:Verbena_simplex.jpg13:39+194](/w/index.php?title=File:Verbena_simplex.jpg&oldid=7746){kind=link}
