Subfamily Cypripedioideae Paphiopedilum, often called the Venus slipper, is a genus of the Lady slipper orchid subfamily Cypripedioideae of the flowering plant family Orchidaceae. Stock Free Paphiopedilum, often called the Venus slipper, is a genus of the Lady slipper orchid subfamily Cypripedioideae of the flowering plant family Orchidaceae. Stock Free