Native to:
Bangladesh,
Cambodia,
Caroline Is.,
China North-Central,
China South-Central,
China Southeast,
East Himalaya,
Hainan,
India,
Inner Mongolia,
Japan,
Jawa,
Korea,
Laos,
Malaya,
Maluku,
Manchuria,
Myanmar,
Nansei-shoto,
New Guinea,
Northern Territory,
Ogasawara-shoto,
Philippines,
Primorye,
Solomon Is.,
Taiwan,
Thailand,
Tibet,
Vietnam
Introduced into:
Alabama,
Angola,
Argentina Northeast,
Arkansas,
Assam,
Azores,
Bermuda,
Burundi,
Cameroon,
Central African Repu,
Dominican Republic,
Ethiopia,
Fiji,
Florida,
Gabon,
Georgia,
Ghana,
Gilbert Is.,
Hawaii,
Honduras,
Illinois,
Kansas,
Kentucky,
Krym,
Liberia,
Louisiana,
Maine,
Maryland,
Massachusetts,
Mississippi,
Mozambique,
Nepal,
New Caledonia,
New Jersey,
New South Wales,
New York,
Nigeria,
Niue,
Norfolk Is.,
North Carolina,
Northern Provinces,
Nova Scotia,
Oklahoma,
Pakistan,
Panamá,
Pennsylvania,
Queensland,
Samoa,
Senegal,
Sierra Leone,
Society Is.,
South Carolina,
Sudan,
Tadzhikistan,
Tennessee,
Texas,
Tonga,
Transcaucasus,
Ukraine,
Vanuatu,
Virginia,
Wallis-Futuna Is.,
West Himalaya,
Yugoslavia,
Zaïre