TONY WOOD / SCIENCE PHOTO LIBRARY TONY WOOD / SCIENCE PHOTO LIBRARY
Hazel tree (Corylus avellana contorta). This tree is bearing catkins, clusters of small flowers. The catkins release pollen, the male reproductive cells of the plant. This occurs in spring. Large quantities of hazel pollen are released, and this can cause hay fever in some people. The hazel is native to Europe.
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