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The term perianth (sometimes called perigonium) has two similar but separate meanings in botany:
- In flowering plants, the perianth consists of the calyx (all sepals) and the corolla (all petals) of the flower.
- In liverworts (Marchantiophyta), the perianth is the sterile tubelike tissue that surrounds the female reproductive structure (or developing sporophyte).
A perianth maybe green in colour. When it is not green in colour it is known as a Petaloid.
- The dictionary definition of perianth at Wiktionary
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