Cypripedium acaule is a species of flower that is commonly known as the pink lady's slipper or moccasin flower. It is a beautiful and rare flower that is native to North America. The pink lady's slipper is a member of the orchid family and is prized for its delicate beauty and unique shape. There are several synonyms for Cypripedium acaule, including Cypripedium arietinum, Cypripedium calceolus var. arietinum, Cypripedium calceolus var. pubescens and Cypripedium pubescens var. arietinum. No matter what it is called, the pink lady's slipper remains a stunning and sought-after flower for nature enthusiasts and collectors alike.