A European warm waters neophyte Shinnersia rivularis - new alien species to the Slovak flora

Shinnersia rivularis is reported as a new alien species of the Slovak flora. The species was found in the catchment water of a thermal spring at a site in Partizanske, part VeA3/4k, Bielice (West Slovakia) in 2002. In the year of discovery, plants formed single population of about 30 square metres of water surface of the canal discharging warm water from the spa. Two populations covering the area ca 90 square meters were found in 2007. A brief description of the species is given and its distribution in Central Europe is reviewed. So far, the species has been reported from only three localities in Central Europe, which are distributed in three countries: Austria, Hungary and Germany.