Floating pennywort (IMAGE) UK Centre for Ecology & Hydrology Caption Floating pennywort's rapid growth reduces sunlight and oxygen, resulting in the death of native aquatic plants. Credit UKCEH Usage Restrictions None License Original content 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.