Cypripedium calceolus
In Poland, it was put into statutory protection since 1946, but was still listed as an endangered species in 2003. It is listed as one of 45 species that are listed under the 'Red Data List of Endangered Vascular Plants' of Poland. Including green spleenwort ("Asplenium viride"), variegated horsetail ("Equisetum variegatum"), great sundew ("Drosera anglica"), marsh pennywort ("Hydrocotyle vulgaris"), common butterwort ("Pinguicula vulgaris"), small fleabane ("Pulicaria vulgaris"), yarrow broomrape ("Orobanche purpurea"), marsh felwort ("Swetia perennis"), fritillary ("Fritilaria meleagris"), and 20 other orchid species, including the lady's slipper ("Cypripedium calceolus").