|} Cypripedium acaule is a member of the orchid genus Cypripedium. Members of this genus are commonly referred to as Lady's Slipper orchids. First described in the 1700s, Cypripedium acaule is commonly referred to as the Pink Lady's Slipper. An alba variety exists which has a white lip instead of a pink one. In Nova Scotia, Canada it is a protected plant, and it is endangered.