Native to:
Alabama,
Alaska,
Alberta,
Altay,
Arizona,
Arkansas,
Austria,
Baleares,
British Columbia,
Bulgaria,
California,
Canary Is.,
Central European Russia,
China North-Central,
China South-Central,
China Southeast,
Colorado,
Connecticut,
Czechoslovakia,
Delaware,
District of Columbia,
Finland,
Florida,
France,
Georgia,
Germany,
Great Britain,
Greece,
Idaho,
Illinois,
India,
Indiana,
Iran,
Ireland,
Italy,
Kansas,
Kazakhstan,
Kentucky,
Kirgizstan,
Krasnoyarsk,
Lebanon-Syria,
Louisiana,
Maine,
Maryland,
Massachusetts,
Mexico Northeast,
Michigan,
Minnesota,
Mississippi,
Missouri,
Montana,
Nepal,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Carolina,
North Caucasus,
North European Russia,
Norway,
Nova Scotia,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pakistan,
Pennsylvania,
Poland,
Québec,
Rhode I.,
Romania,
Sardegna,
Saudi Arabia,
South Carolina,
South Dakota,
Spain,
Sweden,
Switzerland,
Taiwan,
Tennessee,
Texas,
Tibet,
Transcaucasus,
Turkey,
Turkey-in-Europe,
Utah,
Uzbekistan,
Vermont,
Virginia,
Washington,
West Himalaya,
West Siberia,
West Virginia,
Wisconsin,
Wyoming,
Xinjiang,
Yugoslavia