Native to:
Albania,
Algeria,
Andaman Is.,
Assam,
Austria,
Bangladesh,
Belgium,
Bulgaria,
Cambodia,
China North-Central,
China South-Central,
China Southeast,
Christmas I.,
Czechoslovakia,
Denmark,
East Himalaya,
France,
Germany,
Great Britain,
Greece,
Hainan,
Hungary,
India,
Inner Mongolia,
Iran,
Ireland,
Italy,
Japan,
Jawa,
Kazan-retto,
Korea,
Krym,
Kuril Is.,
Laccadive Is.,
Laos,
Lesser Sunda Is.,
Malaya,
Manchuria,
Morocco,
Myanmar,
Nansei-shoto,
Nepal,
Netherlands,
New Guinea,
Nicobar Is.,
North Caucasus,
Norway,
Ogasawara-shoto,
Philippines,
Poland,
Portugal,
Queensland,
Romania,
Sakhalin,
Spain,
Sri Lanka,
Sumatera,
Sweden,
Switzerland,
Taiwan,
Thailand,
Tibet,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Ukraine,
Vietnam,
West Himalaya,
Yugoslavia
Introduced into:
Alabama,
Argentina Northeast,
Argentina Northwest,
Arkansas,
Azores,
Baleares,
Belarus,
Canary Is.,
Central European Russia,
Colorado,
Costa Rica,
El Salvador,
Free State,
Georgia,
Guatemala,
Hawaii,
Honduras,
Illinois,
Juan Fernández Is.,
Kentucky,
Lesotho,
Marianas,
Maryland,
Mauritius,
Mexico Southeast,
Mississippi,
New Caledonia,
New Mexico,
New York,
New Zealand North,
Norfolk Is.,
North Carolina,
Oklahoma,
Panamá,
Réunion,
South European Russia,
St.Helena,
Tasmania,
Tennessee,
Trinidad-Tobago,
Vermont,
Wisconsin