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) From Wikipedia, the free encyclopedia
The perianth (perigonium, perigon or perigone in monocots) is the non-reproductive part of the flower. It forms an envelope surrounding the sexual organs. [1]
It includes the calyx (sepals) and the corolla (petals) when called a perigone.
The term perianth is got from the Greek περί (peri, "around") and άνθος (anthos, "flower"). Perigonium is got from περί (peri) and γόνος (gonos, "seed, sex organs").
In the mosses and liverworts (Marchantiophyta), the perianth is the sterile tubelike tissue that surrounds the female reproductive structure (or developing sporophyte).
References
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