JOHN GREIM / SCIENCE PHOTO LIBRARY JOHN GREIM / SCIENCE PHOTO LIBRARY
Water lettuce (Pistia straroites) plants floating on water. This aquatic plant was originally from Africa, but has now spread to most tropical waterways worldwide. It is often considered an invasive weed, as it can form dense mats that can clog waterways and kill native plants and animals. Photographed in Bermuda.
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