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Africa Northern Africa Morocco Europe Eastern Europe Baltic States Belarus Central European Russia East European Russia North European Russia Ukraine Middle Europe Austria Belgium Czechoslovakia Germany Hungary Netherlands Poland Switzerland Northern Europe Denmark Finland Føroyar Great Britain Ireland Norway Sweden Southeastern Europe Bulgaria Italy Romania Yugoslavia Southwestern Europe France Spain Introduced into Antarctic Subantarctic Islands Falkland Is. Europe Eastern Europe Krym Northern Europe Iceland Northern America Eastern Canada New Brunswick Newfoundland Nova Scotia Ontario Québec North-Central U.S.A. Illinois Iowa South Dakota Wisconsin Northeastern U.S.A. Connecticut Maine Masachusettes New Hampshire New Jersey New York Ohio Pennsylvania Rhode I. Vermont Northwestern U.S.A. Montana Oregon Washington Southeastern U.S.A. Maryland Western Canada British Columbia Manitoba Southern America Brazil Rio Grande do Sul Southern South America Argentina Northeast Argentina South