Native to:
Afghanistan,
Alaska,
Alberta,
Aleutian Is.,
Algeria,
Altay,
Amur,
Antipodean Is.,
Argentina Northeast,
Argentina Northwest,
Argentina South,
Arizona,
Austria,
Baleares,
Baltic States,
Belarus,
Belgium,
Bolivia,
British Columbia,
Bulgaria,
Buryatiya,
California,
Canary Is.,
Cape Provinces,
Central European Rus,
Chatham Is.,
Chile Central,
Chile North,
Chile South,
China North-Central,
China South-Central,
China Southeast,
Chita,
Colorado,
Connecticut,
Corse,
Cyprus,
Czechoslovakia,
Denmark,
East Aegean Is.,
East European Russia,
Ecuador,
Falkland Is.,
Finland,
France,
Free State,
Føroyar,
Germany,
Great Britain,
Greece,
Greenland,
Hungary,
Iceland,
Idaho,
Inner Mongolia,
Iran,
Ireland,
Irkutsk,
Italy,
Japan,
Kamchatka,
Kansas,
Kazakhstan,
Khabarovsk,
Kirgizstan,
Korea,
Krasnoyarsk,
Krym,
Kuril Is.,
Labrador,
Lebanon-Syria,
Macquarie Is.,
Magadan,
Maine,
Manchuria,
Manitoba,
Massachusetts,
Minnesota,
Mongolia,
Montana,
Morocco,
Namibia,
Nebraska,
Nepal,
Netherlands,
Nevada,
New Brunswick,
New Hampshire,
New Mexico,
New South Wales,
New York,
New Zealand North,
New Zealand South,
Newfoundland,
North Caucasus,
North Dakota,
North European Russi,
Northwest European R,
Northwest Territorie,
Norway,
Nova Scotia,
Nunavut,
Ontario,
Oregon,
Pakistan,
Palestine,
Peru,
Poland,
Portugal,
Primorye,
Prince Edward I.,
Qinghai,
Québec,
Rhode I.,
Romania,
Sakhalin,
Sardegna,
Saskatchewan,
Sicilia,
South Australia,
South Dakota,
South European Russi,
Spain,
Svalbard,
Sweden,
Switzerland,
Tadzhikistan,
Tasmania,
Texas,
Tibet,
Transcaucasus,
Tunisia,
Turkey,
Turkey-in-Europe,
Turkmenistan,
Tuva,
Ukraine,
Uruguay,
Utah,
Uzbekistan,
Vermont,
Victoria,
Washington,
West Himalaya,
West Siberia,
Western Australia,
Wisconsin,
Wyoming,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon
Introduced into:
Delaware,
Illinois,
Indiana,
Iowa,
Kentucky,
Maryland,
Michigan,
Missouri,
New Jersey,
Ohio,
Pennsylvania,
Virginia,
West Virginia