Notes from NEET topper
Aestivation:
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Aestivation refers to the arrangement of sepals or petals in a floral bud before they open.
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Common aestivation patterns include:
a) Valvate: Overlapping but not touching.
b) Twisted (Contorted): Overlapping with one margin inside the other.
c) Imbricate: Overlapping, with one sepal or petal covering the other partially.
d) Vexillary (Papilionaceous): In pea flowers, with one large petal (banner) outside, two lateral petals (wings), and two smaller fused petals (keel) inside.
e) Quincuncial: When sepals or petals are arranged in a whorl of five, with two partially overlapping outer elements and three inner elements.
