Photo by Bill Reynolds

The showy false whorls of yellow flowers and variegated leaves make yellow archangel (Lamiastrum galeobdolon) easy to identify. It is native to Europe and western Asia, where it is cultivated as an ornamental. It was imported into North America as a garden plant and has escaped cultivation. It has become naturalized in California and the northeast United States, where it is considered an invasive species. It is uncommon in Minnesota where, to date, it has been recorded only in St. Louis County.

http://www.minnesotaseasons.com/Plants/yellow_archangel.html