Question

Define aestivation.

Answer 1

The mode of arrangement of sepals or petals in the floral bud.

Types of aestivation :

1. Valvate: Sepals or petals do not overlap the sepal or petal at margins.
2. Twisted: Sepals or petals overlap the next sepal or petal.
3. Imbricate: The margins of sepals or petals overlap one another but not in any definite direction.
4. Vexillary: The largest petal overlaps the two lateral petals which in turn overlap the two smallest anterior petals.