| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Orchidaceae | Cypripedium acaule | Pink Lady's-slipper, Moccasin-flower | Dry to mesic, acid forests and woodlands, often under pine, other conifers, and/or oaks. | NL (Newfoundland) west to n. AB, south to NC, SC, GA, n. AL, TN, n. IN, and MN. |  |
| Orchidaceae | Cypripedium candidum | White Lady's-slipper | Calcareous barrens, bluffs, and fens. | NY and NJ west to ND, south to w. VA, nw. and sc. AL, and MO. |  |
| Orchidaceae | Cypripedium kentuckiense | Kentucky Yellow Lady's-slipper | Sandy ravine bottoms and springhead seeps along small streams. | KY, AR, and OK south to GA, AL, MS (ambiguous specimen), LA, and e. TX; disjunct in e. VA (Weldy et al. 1996). |  |
| Orchidaceae | Cypripedium parviflorum var. makasin | Calcareous wetlands, such as fens, wet prairie, Thuja swamp margins. | NL west to YU, south to n. NJ, nw. PA, n. OH, sc. IN, n. IL, IA, ND, MT, UT, and CA. |  | |
| Orchidaceae | Cypripedium parviflorum var. parviflorum | Small Yellow Lady's-slipper | Mesic forests, seepy forests over amphibolite, other habitats. | VT, NY, OH, IN, IL, MO and KS, south to NC, GA (?), AL (AL), AR, and OK. |  |
| Orchidaceae | Cypripedium parviflorum var. pubescens | Large Yellow Lady's-slipper, Whippoorwill Shoes | Rich mesic forests. | NL (Labrador) and AK south to GA, AL, MS, NM, and AZ. |  |
| Orchidaceae | Cypripedium reginae | Showy Lady's-slipper, Queen Lady's-slipper | Fens, seepage swamps, and mesic forests, over circumneutral to basic rocks. | NL (Newfoundland), ON and SK south to NC (?), ne. TN, c. TN (Breeden 2018), n. AR, and e. ND. The native occurrence of this species in NC is questionable; the only definite specimen from the state is from an implausible habitat for the species (highly acid humus under rhododendron). Other rumors of occurrence in NC have not been substantiated. Likewise, with dubious records from GA: reported by a long-term resident of Rabun County to Wilbur Duncan, as having formerly occurred in Rabun Gap (Steve Bowling, pers.comm.). Also cited from Georgia by Fernald (1950), Gleason & Cronquist (1991), and Small (1903, 1933). |  |
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