GEORGE BERNARD / SCIENCE PHOTO LIBRARY GEORGE BERNARD / SCIENCE PHOTO LIBRARY
Water cabbage. A dense cluster of the aquatic plant Pistia stratioites, also known as the "water cabbage". Each plant consists of a floating rosette of leaves; there are sleep movements in that the rosette opens out in the day and closes up at night. Short submerged roots absorbs mineral nutrients. Photographed in Venezuela.
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