The classification of our native yellow lady's-slippers has been in flux. Traditionally, they were considered to be the same species as Eurasian yellow lady's-slippers: Cypripedium calceolus. The modern trend is to separate the American plants from the Eurasian, but the number of American species is under debate. Some botanists recognize two species in northeastern U.S. -- Cypripedium parviflorum and Cypripedium pubescens -- but these species are defined differently by different authorities. On this site, we are following the Vascular Plants of Connecticut Checklist, which classifies all yellow lady's-slippers of northeastern U.S. as varieties of a single species, Cypripedium parviflorum.
Yellow lady's-slipper is rare in Connecticut; it is classified as a species of special concern in the state.
- Synonyms: Cypripedium calceolus
- Family: orchid (Orchidaceae)
- Habitat: bogs, shady swamps, wet woods
- Height: 18-24 inches
- Flower size: yellow lip petal 1 to 2 inches long
- Flowering time: May to June
- Origin: native