Native to:
Afghanistan,
Alaska,
Albania,
Alberta,
Aleutian Is.,
Altay,
Amur,
Antipodean Is.,
Arizona,
Austria,
Baltic States,
Belarus,
Belgium,
British Columbia,
Bulgaria,
Buryatiya,
California,
Cameroon,
Central European Rus,
Chatham Is.,
China North-Central,
China South-Central,
Chita,
Colorado,
Congo,
Connecticut,
Czechoslovakia,
Denmark,
East European Russia,
East Himalaya,
Ethiopia,
Finland,
France,
Føroyar,
Germany,
Great Britain,
Greece,
Greenland,
Gulf of Guinea Is.,
Hungary,
Iceland,
Idaho,
Illinois,
Indiana,
Inner Mongolia,
Iran,
Ireland,
Irkutsk,
Italy,
Japan,
Kamchatka,
Kazakhstan,
Kentucky,
Kenya,
Khabarovsk,
Kirgizstan,
Korea,
Krasnoyarsk,
Krym,
Kuril Is.,
Labrador,
Magadan,
Maine,
Manchuria,
Manitoba,
Maryland,
Massachusetts,
Mexico Northeast,
Michigan,
Minnesota,
Mongolia,
Montana,
Nepal,
Netherlands,
Nevada,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New South Wales,
New York,
New Zealand North,
New Zealand South,
Newfoundland,
North Carolina,
North Caucasus,
North Dakota,
North European Russi,
Northwest European R,
Northwest Territorie,
Norway,
Nova Scotia,
Nunavut,
Ohio,
Ontario,
Oregon,
Pakistan,
Pennsylvania,
Poland,
Portugal,
Primorye,
Prince Edward I.,
Qinghai,
Québec,
Rhode I.,
Romania,
Rwanda,
Sakhalin,
Saskatchewan,
Sicilia,
South Dakota,
South European Russi,
Spain,
Svalbard,
Sweden,
Switzerland,
Tadzhikistan,
Taiwan,
Tanzania,
Tasmania,
Tibet,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Tuva,
Uganda,
Ukraine,
Utah,
Uzbekistan,
Vermont,
Victoria,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon,
Zaïre
Introduced into:
Argentina Northwest,
Argentina South,
Bolivia,
Brazil South,
Cape Provinces,
Chile Central,
Chile South,
Hawaii,
Lesotho,
Macquarie Is.,
South Australia,
South Georgia