Question

Describe the aestivation of a flower.



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Answer 1

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➡AESTIVATION

The arrangement of sepals or petals in the floral bud with respect to other members of the same whorl is called aestivation. It can be of the following types:

⭐Valvate: In valvate aestivation, the margin of sepals or petals just touch the margin of adjacent sepals or petals. There is no overlapping between the sepals or petals.
✔Example:Calotropis.

⭐Twisted: In twisted aestivation, the margin of sepals or Petals overlaps the margin of adjacent successive sepals or petals.
✔Example:China rose, Lady's finger, Cotton.

⭐Imbricate: In Imbricate aestivation, the margin of sepals or petals overlaps each other but not in a particular direction.
✔Example:Cassia, Gulmohur.

⭐Vexillary: In Vexillary aestivation, the largest petals called standard overlaps the two smaller lateral petals called wings which in turn overlaps the two smallest anterior petals called keels.
✔Examples:Pea and bean flower.

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Answer 2

Aestivation or estivation is the positional arrangement of the parts of a flower within a flower bud before it has opened. Aestivation is also sometimes referred to as praefoliation or prefoliation, but these terms may also mean vernation: the arrangement of leaves within a vegetative bud.

Aestivation can be an important taxonomic diagnostic; for example Malvaceae flower buds have valvate sepals, with the exception of the genera Fremontodendron and Chiranthodendron, which have sometimes been misplaced as a result.

The terms used to describe aestivation are the same as those used to describe leaf vernation.[1] Classes of aestivation include:

imbricate – overlapping

contorted or twisted – every petal or sepal is outside its neighbour on one margin, and inside its neighbour on the other margin

cochleate – spirally twisted

contortiplicate – contorted and also plicate

quincuncial – with five parts, where two petals or sepals are outside all others, two are inside all others, and the fifth is outside on one margin and inside on the other

crumpled

decussate

induplicate – folded inwards

open – petals or sepals do not overlap or even touch each other

reduplicate – folded outwards

valvate – margins of adjacent petals or sepals touch each other without overlapping.

Vexillary aestivation is a special type of aestivation occurring in plants like pea. In this type of aestivation a large petal called standard encloses two smaller petals called

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