Lady's slipper orchids in Illinois Apr 16, 2018 9:00 am by Danielle RuffattoVIDEOplants Share on Facebook Tweet Email Images Happy National Orchid Day! To celebrate, here are five of the six lady's slipper orchids* found in Illinois. *Three of these orchid species are listed by the state of Illinois as endangered, meaning it is illegal to take or possess them. Share on Facebook Tweet Email