Describe vexillary aestivation with a suitable example.


Aestivation is the arrangement inside a bud of the floral parts until it blooms into a flower. Sepals or petals’ arrangement in a floral bud concerning other members of the same whorl is called as
aestivation. Different types of aestivation are:

  • Twisted – if one margin of the appendage overlaps the adjacent one, it is twisted, which can either be
    clockwise or anti-clockwise. Example – cotton
  • Valvate – In a whorl when petals or sepals just touch each other at the margin without overlapping, it is
    valvate. Example – Calotropis
  • Imbricate – It is imbricate when petals or sepals overlap each other but not in any definite direction as
    observed in Gulmohar
  • Vexillary – The largest petal overlaps the two lateral petals which in turn overlap the two smallest
    anterior peel is vexillary aestivation. Example – Bean flower

Vexillary aestivation

Vexillary aestivation is the unique arrangement where the other smaller petals are covered by one large petal. The larger petal is called a vexillum, while the two curved petals which are laterally positioned are called wings. In this destination, the two inmost, boat-shaped petals are called keels.
Examples: Polypetalous, papilionaceous.

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