Cypripedium luteum var. parviflorum (Salisb.) Raf.
Criosanthes parviflora (Salisb.) Raf.
Calceolus parviflorus (Salisb.) Nieuwl.
Cypripedium calceolus var. parviflorum (Salisb.) Fernald
Cypripedium parviflorum, commonly known as Yellow Lady's Slipper, Mocassin Flower, or Hairy Yellow Ladyslipper is a Lady's Slipperorchid found in North America.
Cypripedium parviflorum is a highly variable species across its range with hybridization known. Variety pubescens is sometimes treated as a separate species, Cypripedium pubescens. This taxon has larger flowers with sepals unmarked, spotted, or striped as opposed to uniformly dark.