Which of the following aestivations involves non-uniform overlapping of petals?

Step-by-step solution

Aestivation: The mode of arrangement of sepals or petals in floral bud with respect to the other members of the same whorl is known as aestivation. The main types of aestivation are valvate, twisted, imbricate and vexillary . Valvate Aestivation: Petals or Sepals in a whorl merely meet by their edges without overlapping. Example: Sepals of Hibiscus.