CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY
Water horsetail (Equisetum fluviatile) stems. Horsetails are primitive plants that have existed since the Carboniferous period (360- 299 million years ago). Today, although only 15 species still exist, they are found across much of the world.
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