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Flower cap

A flower cap is the fused petals of a grapevine flower that covers the stamens and carpels. During flowering the caps fall off so that the pollen grains from the stamens can fertilize an egg within a carpel (of another flower). When 50% of the caps have fallen off all the flowers in the grape bunch, this is defined as the flowering growth stage. The scientific name for a flower cap is ‘Calyptra, which literally translates to ‘covering hood’.


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