"Cypripedium arietinum Ait. f." North American Orchid Conservation Center. 2011. Retrieved 30 July 2024. ...has a limited distribution across northeastern and central Canada and the U.S., from Quebec to Wisconsin.
usda.gov
plants.sc.egov.usda.gov
USDA, NRCS (n.d.). "Cypripedium arietinum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 1 July 2016.