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The perianth is the non-reproductive part of a flower. It is a structure consisting of the calyx (sepals) and the corolla (petals); in perigones it consists of the tepals. It forms an envelope surrounding the sexual organs,. The term perianth is derived from Greek περί and άνθος, while perigonium is derived from περί and γόνος .
In the mosses and liverworts (Marchantiophyta), the perianth is the sterile tube-like tissue that surrounds the female reproductive structure or developing sporophyte.
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