Column I Column II
A Imbricate aestivation i Calotropis
B Vexillary aestivation ii China-rose corolla
C Twisted aestivation iii Corolla of Cassia
D Valvate aestivation iv Corolla of bean

Easy

Solution

Valvate aestivation - Calyx and corolla of Calotropis
Imbricate aestivation - Corolla of Caesalpiniaceae (Cassia, Gulmohur)
Twisted aestivation - Corolla of China-rose, Lady's finger, Cotton
Vexillary aestivation - Corolla of Fabaceae members (bean, pea)

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