DistributionRead full entry
Cypripedium acaule is widespread in eastern North America and is abundant and common in the eastern and northeastern parts of its range.
Cypripedium acaule can be found from Alberta, Saskatchewan, and Manitoba across southern Ontario and Quebec, the Great Lakes region and from Newfoundland down the east coast of the United States to the central Georgia Piedmont and west to Alabama and Tennessee.
The species occurs in USA [Alabama (S3), Connecticut (SNR), Delaware (S4), District of Columbia (SNR), Georgia (S4), Illinois (S1), Indiana (S3), Kentucky (S4), Maine (SNR), Maryland (SNR), Massachusetts (SNR), Michigan (SNR), Minnesota (SNR), New Hampshire (SNR), New Jersey (S4), New York (S4), North Carolina (S5), Ohio (SNR), Pennsylvania (SNR), Rhode Island (S4), South Carolina (SNR), Tennessee (S4), Vermont (SNR), Virginia (S5), West Virginia (S5), Wisconsin (SNR)) and Canada [Alberta (S3), Manitoba (S4), New Brunswick (S5), Newfoundland Island (S4), Northwest Territories (SNR), Nova Scotia (S5), Ontario (S5), Prince Edward Island (S5), Quebec (S5), Saskatchewan (S4?)].
The extent of occurrence (EOO) is estimated at 2,789,117 km ² and the area of occupancy (AOO) is estimated at 2,848 km ².
The species can be found from sea level up to 1,200 m altitude.
Sources for distribution information: Cribb 1997, Frosch and Cribb 2012, Gupton et al. 1986, Homoya 1993, Kartesz 1994, Luer 1995, Meades et al. 2000, Patrick et al. 1995, Pepoon 1927 and Sheviak 1974.