[Wikipedia] Introduced in North America: In North America, it is an introduced species and widely naturalized mostly in the Northeastern United States, eastern Canada and the Great Lakes Region, but also in scattered locations in other parts of the continent.[11][12][1] In the US it is sometimes referred to as the "weed orchid" or "weedy orchid" and continues to spread throughout the country to new areas including Michigan,[13] Wisconsin,[14] and the San Francisco Bay Area. (link added by Mary Ann Machi)