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Sepal

Any of the separate parts of the calyx of a flower (excluding the bracts), usually green / From Wikipedia, the free encyclopedia

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A sepal (/ˈsɛpəl, ˈsiːpəl/)[1][2][3] is a part of the flower of angiosperms (flowering plants). Usually green, sepals typically function as protection for the flower in bud, and often as support for the petals when in bloom.[4]

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Diagram showing the parts of a mature flower. In this example the perianth is separated into a calyx (sepals) and corolla (petals)
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Tetramerous flower of Ludwigia octovalvis showing petals and sepals.
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After blooming, the sepals of Hibiscus sabdariffa expand into an edible accessory fruit
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In many Fabaceae flowers, a calyx tube surrounds the petals.
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The large calyx of the medlar fruit is the source of its vulgar nicknames.