Name the type of aestivation when sepals or petals in a whorl just touch one another at the margin without overlapping
A
Twisted aestivation
B
Valvate aestivation
C
Imbricate aestivation
D
Vexillary aestivation
A.
(b) Valvate aestivation.
Aestivation The mode of arrangement of sepals or petals in floral buds with respect to other members of the same whorl is known as aestivation
Main types of aestivation are
(i) Valvate When sepals or petals in a whorl just touch one another at margin without overlapping e.g., Calotropis
(ii) Twisted If one margin of the appendages ovarlaps that of the next one and so on. e.g., China rose, cotton, lady’s finger
(ii) Imbricate If the margins of sepals or petals overlap one another but not in any particular direction, e.g., Cassia and gulmohar
(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 or papilionaceous
