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– Flowering plants
Perianth in flowering plants can be dichlamydeous/heterochlamydeous or homochlamydeous.
– Biseriate perianth has two whorls.
– Calyx may be sepaloid or petaloid.
– Tepals resembling petals are called petaloid.
– Absence of petals or sepals results in a monochlamydeous perianth.

– Types of perianth
– Achlamydeous floral meristem lacks corolla or calyx.
– Monochlamydeous perianth can have non-petaloid calyx only.
– Dichlamydeous/heterochlamydeous perianth has separate whorls.
– Sepals and petals may have stomata and veins.
– Some species like magnolias have spiral perianths.

– Corona
– The corona is an additional structure in plants like Narcissus and Passiflora.
– Milkweeds have three distinct coronas for pollination.
– Some Passionflowers can have up to eight coronas.
– Pappus of Asteraceae is considered a modified calyx or corona.
– Coronas can be positioned where corolla lobes arise.

– References
– Beentje and Williamson published “The Kew Plant Glossary.”
– George H.M. Lawrence’s work “Taxonomy of Vascular Plants” is a significant reference.
– Engler and Prantl’s work on plant families is a valuable resource.

– Bibliography
– Michael G. Simpson’s “Plant Systematics” is a key book.
– Simpson’s book was published by Academic Press.
– The book has an ISBN of 978-0-08-051404-8.
– The book was retrieved on 12 February 2014.

– External links
– Wikimedia Commons hosts media related to Petals.

Perianth (Wikipedia)

The perianth (perigonium, perigon or perigone in monocots) is the non-reproductive part of the flower, and structure that forms an envelope surrounding the sexual organs, consisting of the calyx (sepals) and the corolla (petals) or tepals when called a perigone. 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 tubelike tissue that surrounds the female reproductive structure (or developing sporophyte).

A mature flower. In this example, the perianth is separated into a calyx (sepals) and corolla (petals)
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