Native to:
Alaska,
Alberta,
Arizona,
Arkansas,
Assam,
British Columbia,
California,
China North-Central,
China South-Central,
China Southeast,
Colorado,
Connecticut,
Delaware,
East Himalaya,
Idaho,
Illinois,
India,
Indiana,
Iowa,
Japan,
Kamchatka,
Kentucky,
Khabarovsk,
Kuril Is.,
Labrador,
Maine,
Manitoba,
Maryland,
Massachusetts,
Mexico Northwest,
Michigan,
Minnesota,
Montana,
Nebraska,
Nepal,
Nevada,
New Brunswick,
New Hampshire,
New Jersey,
New Mexico,
New York,
Newfoundland,
North Carolina,
Northwest Territorie,
Nova Scotia,
Ohio,
Ontario,
Oregon,
Pakistan,
Pennsylvania,
Primorye,
Prince Edward I.,
Qinghai,
Québec,
Rhode I.,
Sakhalin,
Saskatchewan,
South Dakota,
Sri Lanka,
Taiwan,
Tennessee,
Texas,
Thailand,
Tibet,
Utah,
Vermont,
Vietnam,
Virginia,
Washington,
West Himalaya,
West Virginia,
Wisconsin,
Wyoming,
Yukon
Introduced into:
Austria,
Baltic States,
Czechoslovakia,
Denmark,
France,
Germany,
Great Britain,
Ireland,
Italy,
Netherlands,
Norway,
Poland,
Romania,
Sweden,
Switzerland