Native to:
Afghanistan,
Alaska,
Albania,
Alberta,
Altay,
Amur,
Arizona,
Austria,
British Columbia,
Bulgaria,
California,
China North-Central,
China South-Central,
Colorado,
Connecticut,
Corse,
East European Russia,
East Himalaya,
Finland,
France,
Føroyar,
Georgia,
Germany,
Great Britain,
Greece,
Greenland,
Iceland,
Idaho,
Illinois,
Iowa,
Iran,
Iraq,
Italy,
Japan,
Kamchatka,
Kazakhstan,
Khabarovsk,
Kirgizstan,
Korea,
Labrador,
Magadan,
Maine,
Manchuria,
Massachusetts,
Mexico Central,
Mexico Gulf,
Michigan,
Minnesota,
Mongolia,
Montana,
Nepal,
Nevada,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Carolina,
North Caucasus,
North Dakota,
North European Russia,
Northwest Territories,
Norway,
Nova Scotia,
Nunavut,
Ontario,
Oregon,
Pakistan,
Pennsylvania,
Poland,
Primorye,
Prince Edward I.,
Qinghai,
Québec,
Rhode I.,
Sakhalin,
Saskatchewan,
Spain,
Svalbard,
Sweden,
Switzerland,
Tadzhikistan,
Taiwan,
Tennessee,
Tibet,
Transcaucasus,
Turkey,
Utah,
Vermont,
Virginia,
Washington,
West Himalaya,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon
Introduced into:
Maryland