The flower at the left has freshly opened and its petals obscure its sepals. The flower in the centre is more mature, and some of the sepals are visible behind the damaged petals. On the right are older flowers that have dropped their petals, revealing the sepals surrounding the developing fruit.
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(botany) One of the component parts of the calyx, particularly when the sepals in a plant's calyx are not fused into a single structure.