Native to:
Afghanistan,
Albania,
Algeria,
Austria,
Azores,
Baleares,
Baltic States,
Belarus,
Belgium,
British Columbia,
Bulgaria,
Canary Is.,
Cape Provinces,
Cape Verde,
Central European Russia,
China North-Central,
China South-Central,
China Southeast,
Connecticut,
Corse,
Cyprus,
Czechoslovakia,
Denmark,
East European Russia,
East Himalaya,
Ethiopia,
Finland,
France,
Free State,
Føroyar,
Germany,
Great Britain,
Greece,
Hungary,
Iceland,
Illinois,
Iran,
Iraq,
Ireland,
Italy,
Japan,
Kenya,
Korea,
Kriti,
Krym,
KwaZulu-Natal,
Lebanon-Syria,
Lesotho,
Madeira,
Maine,
Maryland,
Massachusetts,
Michigan,
Morocco,
Nepal,
Netherlands,
New Hampshire,
New Jersey,
New York,
North Caucasus,
North European Russia,
Northern Provinces,
Northwest European Russia,
Norway,
Ohio,
Ontario,
Oregon,
Pakistan,
Palestine,
Pennsylvania,
Poland,
Portugal,
Québec,
Romania,
Rwanda,
Sardegna,
Saudi Arabia,
Sicilia,
Socotra,
Somalia,
Spain,
Sweden,
Switzerland,
Taiwan,
Tanzania,
Tibet,
Transcaucasus,
Tunisia,
Turkey,
Turkey-in-Europe,
Ukraine,
Vermont,
Virginia,
Washington,
West Himalaya,
West Virginia,
Wisconsin,
Xinjiang,
Yemen,
Yugoslavia,
Zimbabwe