Native to:
Alaska,
Albania,
Alberta,
Aleutian Is.,
Algeria,
Antipodean Is.,
Argentina Northwest,
Argentina South,
Arizona,
Austria,
Baltic States,
Belarus,
Belgium,
Bolivia,
British Columbia,
Bulgaria,
Buryatiya,
California,
Central European Rus,
Chile Central,
Chile South,
Colombia,
Colorado,
Corse,
Costa Rica,
Crozet Is.,
Czechoslovakia,
Denmark,
East Aegean Is.,
East European Russia,
Ecuador,
Ethiopia,
Falkland Is.,
Finland,
France,
Føroyar,
Germany,
Great Britain,
Greece,
Greenland,
Guatemala,
Heard-McDonald Is.,
Hungary,
Iceland,
Idaho,
Iowa,
Ireland,
Irkutsk,
Italy,
Japan,
Kamchatka,
Kenya,
Kerguelen,
Khabarovsk,
Kriti,
Kuril Is.,
Labrador,
Lebanon-Syria,
Macquarie Is.,
Magadan,
Maine,
Manitoba,
Marion-Prince Edward,
Massachusetts,
Mexico Central,
Mexico Gulf,
Mexico Northeast,
Mexico Northwest,
Mexico Southeast,
Mexico Southwest,
Minnesota,
Montana,
Morocco,
Netherlands,
Nevada,
New Brunswick,
New Guinea,
New Hampshire,
New Mexico,
New South Wales,
New York,
New Zealand North,
New Zealand South,
Newfoundland,
North European Russi,
Northwest European R,
Northwest Territorie,
Norway,
Nova Scotia,
Nunavut,
Ontario,
Oregon,
Pennsylvania,
Peru,
Poland,
Portugal,
Primorye,
Prince Edward I.,
Québec,
Romania,
Rwanda,
Sakhalin,
Sardegna,
Saskatchewan,
Sicilia,
South Australia,
South Georgia,
Spain,
Sweden,
Switzerland,
Tanzania,
Tasmania,
Transcaucasus,
Tunisia,
Turkey,
Turkey-in-Europe,
Uganda,
Uruguay,
Utah,
Venezuela,
Vermont,
Victoria,
Washington,
Western Australia,
Wyoming,
Yakutskiya,
Yugoslavia,
Yukon,
Zaïre
Introduced into:
Maryland,
Mississippi