sepal
Part of a flower, usually green, that surrounds and protects the flower in bud. The sepals are derived from modified leaves, and are collectively known as the calyx.
In some plants, such as the marsh marigold Caltha palustris, where true petals are absent, the sepals are brightly coloured and petal-like, taking over the role of attracting insect pollinators to the flower.
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