perianth
In botany, a collective term for the outer whorls of the flower, which protect the reproductive parts during development. In most dicotyledons the perianth is composed of two distinct whorls, the calyx of sepals and the corolla of petals, whereas in many monocotyledons the sepals and petals are indistinguishable and the segments of the perianth are then known individually as tepals.
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