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The stigma of the receptive flower can barely be seen sticking out over the top of the opening of the corolla (petals). The ovary is hidden inside the corolla.
After pollination, the corolla falls off. The stigma and style wither but the sepals remain at the base of the flower.
As the ovules inside develop into seeds, the ovary lengthens to many times its original size. It is now much larger than the sepals, which can still be seen at the top of the developing fruit.
When mature, the fruit splits open, releasing the many small winged seeds.
The wind-pollinated flowers lack petals and are produced before the leaves. The anthers and stigmas hang below the sepals.
After pollination, the ovary expands beyond the sepals. Wings begin to develop from the sides of the ovaries. The remains of the stigma and style can be seen here. Developing leaves are seen here.
The samaras (winged fruits) are nearly full sized by the time the leaves are developed.