What do you mean by Aestivation? Explain types of aestivation.

Aestivation means arrangement of accessory floral organs(sepals or petals) in relation to one another in a flower.

Some types of Aestivation:

• Open: Margins of adjacent petals are not overlapping / touching others.

• Valvate: Margins of the adjacent petals touch each other but without overlapping ex: Brassica

• Twisted: One margin of a petal overlaps regularly the margin of an adjacent petal.

ex: Chinarose

• Imbricate: Irregular overlapping of petals by one another.

ex: cassia.