Answer :

The mode of arrangements of sepals or petals in a floral bud is known as aestivation.

There are 4 types of aestivations, namely –

i. Valvate –

When sepals or petals in a whorl just touch one another at the margin, without overlapping, as in Calotropis, it is said to be valvate.


ii. Twisted –

If one margin of the appendage overlaps that of the next one and so on as in china rose, lady’s finger and cotton, it is called twisted.

iii. Imbricate –

If the margins of sepals or petals overlap one another but not in any particular direction as in Cassia and gulmohur, the aestivation is called imbricate.


iv. Vexillary –

In pea and bean flowers, there are five petals, the largest (standard) overlaps the two lateral petals (wings) which in turn overlap the two smallest anterior petals (keel); this type of aestivation is known as vexillary.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

The arrangement oBiology - Exemplar

Sunflower is not Biology - Exemplar

The arrangements Biology - Exemplar

Differentiate betBiology - Exemplar

The mode of arranBiology - Exemplar

How can you diffeBiology - Exemplar

A typical angiospBiology - Exemplar

Add the missing fBiology - Exemplar

In epigynous flowBiology - Exemplar