Aestivation is the mode of arrangement of petals and sepals. These sepals and petals are arranged in the floral bud. There are four types of aestivation:Valvate: In this type of arrangement, the sepals and the petals are present in a whorl. They just touch each other and no overlapping takes place. Twisted: Here in this aestivation, the sepal and petals of one flower overlap the sepals and petals of the other flower. The overlapping is present in a particular direction.Imbricate: The sepals and petals are also attached in this type but not in a specific pattern.Vexillary: In this arrangement, the largest of the petals/sepals overlaps the two smaller petals/sepals and then these two overlaps the other two or more present. Flowers are a fascinating part of all plants and these are important for the survival of plant species as it is flowers that take part in reproduction. Here, in this article, we are going to talk about the male reproductive part of a flower i.e., androecium.