Native to:
Afghanistan,
Alabama,
Alaska,
Albania,
Alberta,
Algeria,
Altay,
Arizona,
Arkansas,
Austria,
Azores,
Baleares,
Baltic States,
Belarus,
Belgium,
British Columbia,
Bulgaria,
California,
Canary Is.,
Cape Provinces,
Cape Verde,
Central European Rus,
China North-Central,
China South-Central,
China Southeast,
Colorado,
Connecticut,
Corse,
Cyprus,
Czechoslovakia,
Delaware,
Denmark,
District of Columbia,
East European Russia,
East Himalaya,
Ethiopia,
Finland,
Florida,
France,
Free State,
Føroyar,
Georgia,
Germany,
Great Britain,
Greece,
Hawaii,
Hungary,
Iceland,
Idaho,
Illinois,
India,
Indiana,
Iran,
Iraq,
Ireland,
Italy,
Japan,
Kansas,
Kazakhstan,
Kentucky,
Kenya,
Kirgizstan,
Korea,
Krasnoyarsk,
Kriti,
Krym,
KwaZulu-Natal,
Lebanon-Syria,
Lesotho,
Louisiana,
Madeira,
Maine,
Maryland,
Massachusetts,
Mexico Northeast,
Michigan,
Minnesota,
Mississippi,
Missouri,
Montana,
Morocco,
Nepal,
Netherlands,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Carolina,
North Caucasus,
North European Russi,
Northern Provinces,
Northwest European R,
Norway,
Nova Scotia,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pakistan,
Palestine,
Pennsylvania,
Poland,
Portugal,
Québec,
Rhode I.,
Romania,
Sardegna,
Saudi Arabia,
Sicilia,
Socotra,
Somalia,
South Carolina,
South Dakota,
Spain,
Sweden,
Switzerland,
Taiwan,
Tanzania,
Tennessee,
Texas,
Tibet,
Transcaucasus,
Tunisia,
Turkey,
Turkey-in-Europe,
Ukraine,
Utah,
Uzbekistan,
Vermont,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yemen,
Yugoslavia,
Zimbabwe