Lady Slipper
References
http://www.50states.com/flower/minnesota.htm
http://www.dnr.state.mn.us/snapshots/plants/showyladysslipper.html
http://web4.msue.msu.edu/mnfi/abstracts/botany/cypripedium_candidum.pdf
http://www.fcps.edu/islandcreekes/ecology/pink_ladys_slipper.htm