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If the margins of sepals or petals overlap one another but not in any particular direction as in Cassia and gulmohur, the aestivation is called imbricate.

1. The aestivation is valvate.
2. The aestivation is imbricate.
3. The aestivation is twisted.
4. The aestivation is vexillary.

Correct answer: The aestivation is imbricate.

Solution

Imbricate aestivation is defined by overlapping margins of sepals or petals without a consistent direction, as seen in Cassia and gulmohur. Therefore, the correct choice is the one that names this pattern.

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