Duckweed (image) University of Münster Share Print E-Mail Caption Researchers took samples of duckweed from 68 waterbodies worldwide. Credit Klaus J. Appenroth Usage Restrictions Please use this picture only in connection with the press release. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.