DR. JOHN BRACKENBURY / SCIENCE PHOTO LIBRARY DR. JOHN BRACKENBURY / SCIENCE PHOTO LIBRARY
Plant burrs covered in dew. This structure contains individual fruits (achenes), attached by a papery bract (modified leaf). The end of each bract is hooked, which enables them to become attached to the fur of passing animals, or in human clothing, thus aiding the dispersal of the burr.
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