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.
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👉 Corona (plant structure) in the context of Narcissus (plant)
Narcissus is a genus of predominantly spring flowering perennial plants of the amaryllis family, Amaryllidaceae. Various common names including daffodil, narcissus (plural narcissi), and jonquil, are used to describe some or all members of the genus.
Narcissus has conspicuous flowers with six petal-like tepals surmounted by a cup- or trumpet-shaped corona. The flowers are generally white and yellow (also orange or pink in garden varieties), with either uniform or contrasting coloured tepals and corona.