Native to:
Afghanistan,
Alaska,
Albania,
Alberta,
Aleutian Is.,
Algeria,
Altay,
Amur,
Argentina Northwest,
Argentina South,
Austria,
Azores,
Baltic States,
Belarus,
Belgium,
Bolivia,
Borneo,
British Columbia,
Bulgaria,
Buryatiya,
Central European Rus,
Chile Central,
Chile North,
Chile South,
China North-Central,
China South-Central,
Chita,
Corse,
Czechoslovakia,
Denmark,
East European Russia,
East Himalaya,
Falkland Is.,
Finland,
France,
Føroyar,
Germany,
Great Britain,
Greece,
Greenland,
Hungary,
Iceland,
India,
Inner Mongolia,
Iran,
Iraq,
Ireland,
Irkutsk,
Italy,
Japan,
Juan Fernández Is.,
Kamchatka,
Kazakhstan,
Khabarovsk,
Kirgizstan,
Korea,
Krasnoyarsk,
Kriti,
Krym,
Kuril Is.,
Labrador,
Magadan,
Maine,
Maluku,
Manchuria,
Manitoba,
Michigan,
Minnesota,
Mongolia,
Montana,
Morocco,
Nepal,
Netherlands,
New Brunswick,
New Guinea,
New Hampshire,
New South Wales,
New Zealand North,
New Zealand South,
Newfoundland,
North Caucasus,
North European Russi,
Northwest European R,
Northwest Territorie,
Norway,
Nova Scotia,
Nunavut,
Ontario,
Pakistan,
Philippines,
Poland,
Portugal,
Primorye,
Prince Edward I.,
Qinghai,
Queensland,
Québec,
Romania,
Sakhalin,
Sardegna,
Saskatchewan,
South Australia,
South European Russi,
Spain,
Sulawesi,
Svalbard,
Sweden,
Switzerland,
Tadzhikistan,
Taiwan,
Tasmania,
Tibet,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Turkmenistan,
Tuva,
Ukraine,
Uzbekistan,
Victoria,
West Himalaya,
West Siberia,
Western Australia,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon
Introduced into:
Idaho,
Illinois,
Massachusetts,
New York,
Oregon,
Pennsylvania,
Rhode I.,
Vermont,
Washington,
Wisconsin