Perianth
the part of a flower situated outside the stamens and carpels; in dicotyledons it consists of two distinct whorls, the outer of sepals (calyx) and the inner of petals (corolla)
The perianth (perigonium, perigon or perigone in monocots) 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 (peri, "around") and άνθος (anthos, "flower"), while perigonium is derived from περί (peri) and γόνος (gonos, "seed, sex organs").
In the mosses and liverworts (Marchantiophyta), the perianth is the sterile (neither male nor female) tube-like tissue that surrounds the female reproductive structure or developing sporophyte.
Flowering plants
In flowering plants, the perianth may be described as being either dichlamydeous/heterochlamydeous in which the calyx and corolla are clearly separate, or homochlamydeous, in which they are indistinguishable (and the sepals and petals are collectively referred to as tepals). When the perianth is in two whorls, it is described as biseriate. While the calyx may be green, known as sepaloid, it may also be brightly coloured, and is then described as petaloid. When the undifferentiated tepals resemble petals, they are also referred to as "petaloid", as in petaloid monocots or liliod monocots, orders of monocots with brightly coloured tepals. The corolla and petals have a role in attracting pollinators, but this may be augmented by more specialised structures like the corona (see below).
This brief starts where responsible research should: with the source description of “Perianth” as the part of a flower situated outside the stamens and carpels; in dicotyledons it consists of two distinct whorls, the outer of sepals (calyx) and the inner of petals (corolla). Everything that follows is an evidence route, not borrowed authority.
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The subject matters to the general reference register because the source frames it as the part of a flower situated outside the stamens and carpels; in dicotyledons it consists of two distinct whorls, the outer of sepals (calyx) and the inner of petals (corolla). Its deeper value depends on whether names, dates, institutions and citations support that framing.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Mar 7, 2026. The linked authority identifier is Q504930. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Perianth” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.