Aestivation in which members of a whorl lie close but do not overlap is

Vexillary

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Valvate

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Imbricate

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Twisted

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Solution

The correct option is A Valvate
The aestivation in a flower refers to the arrangement of the calyx and corolla. In valvate aestivation, the members of the whorl lie close but do not overlap each other
A. In vexillary aestivation, there occurs descending overlapping.
B. In valvate aestivation, there is not overlapping.
C. In Imbricate aestivation, there is irregular overlapping.
D. In Twisted aestivation, one unit is overlapped and is also overlapping. It is a regular overlap pattern.
Hence, the correct answer is 'Valvate'

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