DAN GURAVICH / SCIENCE PHOTO LIBRARY DAN GURAVICH / SCIENCE PHOTO LIBRARY
Tulips. Single red tulip (Tulipa sp.) rising above several yellow tulips. The genus Tulipa contains over 100 species and almost countless varieties. Tulips originated in Turkey, and were brought to the rest of Europe in the 16th century. Photographed in Mount Vernon, Washington, USA.
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