Native to:
Afghanistan,
Assam,
China North-Central,
China South-Central,
China Southeast,
East Himalaya,
Hainan,
India,
Japan,
Jawa,
Korea,
Laos,
Lesser Sunda Is.,
Manchuria,
Myanmar,
Nepal,
Pakistan,
Philippines,
Primorye,
Sri Lanka,
Taiwan,
Thailand,
Tibet,
Vietnam,
West Himalaya
Introduced into:
Alabama,
Argentina Northeast,
Argentina Northwest,
Arizona,
Arkansas,
Austria,
Azores,
Belgium,
Bolivia,
Brazil South,
Brazil Southeast,
British Columbia,
Bulgaria,
California,
Canary Is.,
Cape Provinces,
Central European Russia,
Chile Central,
Chile South,
Colombia,
Connecticut,
Czechoslovakia,
Delaware,
District of Columbia,
Ecuador,
Florida,
France,
Georgia,
Germany,
Great Britain,
Guatemala,
Illinois,
Indiana,
Iowa,
Ireland,
Italy,
Kansas,
Kentucky,
KwaZulu-Natal,
Louisiana,
Madeira,
Marianas,
Maryland,
Mauritius,
Mexico Central,
Michigan,
Mississippi,
Missouri,
Nebraska,
Netherlands,
New Jersey,
New South Wales,
New York,
New Zealand North,
New Zealand South,
North Carolina,
North Caucasus,
Northern Provinces,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pennsylvania,
Poland,
Portugal,
Queensland,
Romania,
Réunion,
South Carolina,
South European Russia,
Spain,
Switzerland,
Tadzhikistan,
Tennessee,
Texas,
Transcaucasus,
Turkey,
Ukraine,
Uruguay,
Victoria,
Virginia,
Washington,
West Virginia,
Wisconsin,
Yugoslavia