Records from the Swedish east coast extend the range to 60° 22' N. The paper describes the vegetative and reproductive characters, and discusses the taxonomy, reproductive phenology, size and growth mode, ecology, and modes of dispersal. The known occurrences in the area are situated near ports where in earlier times ballast sand was unloaded and partly thrown into the sea. It seems evident that Ch. connivens Salzm. ex A. Braun has been introduced to the area as an aquatic ballast plant. The known records are listed and some erroneous reports corrected.
Dataset
NISES: AquaNIS. Editorial Board, 2020. Information system on Aquatic Non-Indigenous and Cryptogenic Species. World Wide Web electronic publication. www.corpi.ku.lt/databases/aquanis. Version 2.36+. Accessed 2020-09-09, meer
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