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How do birch catkins release their winged fruits?
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Fagales
European beech (Fagus sylvatica).
In the Fagales order, the release of seeds from birch trees occurs through a specific process involving their catkins.
In the genus Betula, the bracts of the female catkins are deciduous. As the catkin reaches maturity, it shatters, which allows the winged fruits to be released and dispersed by the wind.1