MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
The white flower petals of the Handkerchief Tree (Davidia involucrata) are called bracts. They are modified leaves that often form a flower like structure. Inside the two white bracts, the flower stamen is a purplish sphere with an pistil at its center. This Chinese tree has become a popular ornamental tree in Europe and the USA. Westonbirt Arboretum, UK.
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