The number of petals and sepals in a flower are not always equal. If the sepals of a flower are joined together, the flowers are separate and not joined together, and the pistil is not necessarily joined to the petal.
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The collective name for the petals of a flower is the corolla.
Joined - Hibiscus, Mustard Separated - Lotus, Rose
A lotus flower typically has four to five sepals. Sepals are the outermost ring of protective, leaf-like structures that surround the petals of a flower.
A perianth is the outer part of a flower that consists of the petals and sepals. It protects the reproductive organs of the flower and can also help attract pollinators through its color and shape. The perianth can be made up of separate petals and sepals (as in a lily) or have petals and sepals that are indistinguishable (as in a tulip).
Sepals protect the flower whilst the flower is developing from a bud. It also protects the ovary and supports petals.
A eucalyptus flower typically has four sepals and four petals.
Complete flower
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Jasmine flowers typically have 5 or more petals and 5 sepals. The petals are usually white or yellow and are fragrant, while the sepals are green and protect the flower bud as it develops.
The sterile leaves of the flower are the sepals and the petals.
Sepals protect the flower whilst the flower is developing from a bud. It also protects the ovary and supports petals