Native to:
Alabama,
Alaska,
Albania,
Alberta,
Aleutian Is.,
Algeria,
Altay,
Arizona,
Arkansas,
Austria,
Azores,
Baltic States,
Belarus,
Belgium,
British Columbia,
Bulgaria,
Buryatiya,
California,
Canary Is.,
Central European Russia,
China North-Central,
China South-Central,
China Southeast,
Colombia,
Colorado,
Connecticut,
Corse,
Costa Rica,
Czechoslovakia,
Delaware,
Denmark,
District of Columbia,
East European Russia,
East Himalaya,
Finland,
France,
Føroyar,
Georgia,
Germany,
Great Britain,
Greece,
Guatemala,
Hungary,
Iceland,
Idaho,
Indiana,
Inner Mongolia,
Iowa,
Iran,
Ireland,
Irkutsk,
Italy,
Japan,
Kamchatka,
Kansas,
Kazakhstan,
Kentucky,
Kirgizstan,
Korea,
Krasnoyarsk,
Krym,
Kuril Is.,
Labrador,
Madeira,
Maine,
Manchuria,
Maryland,
Massachusetts,
Mexico Gulf,
Mexico Northwest,
Mexico Southeast,
Michigan,
Minnesota,
Missouri,
Montana,
Morocco,
Netherlands,
Nevada,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Carolina,
North Caucasus,
North Dakota,
North European Russia,
Northwest European Russia,
Norway,
Nova Scotia,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pakistan,
Pennsylvania,
Poland,
Portugal,
Prince Edward I.,
Québec,
Rhode I.,
Romania,
Sakhalin,
Sardegna,
Saskatchewan,
Sicilia,
South Carolina,
South European Russia,
Spain,
Sweden,
Switzerland,
Tennessee,
Tibet,
Transcaucasus,
Tunisia,
Turkey,
Turkey-in-Europe,
Tuva,
Uganda,
Ukraine,
Utah,
Venezuela,
Vermont,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yugoslavia
Introduced into:
Argentina Northeast,
Argentina Northwest,
Argentina South,
Ascension,
Bolivia,
Brazil South,
Cape Provinces,
Chile Central,
Crozet Is.,
Ecuador,
Falkland Is.,
Hawaii,
Jamaica,
Khabarovsk,
KwaZulu-Natal,
Magadan,
Peru,
Primorye,
Réunion,
South Georgia,
Sri Lanka,
St.Helena,
Tasmania,
Tristan da Cunha