A papilionaceous corolla has

valvate aestivation

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twisted aestivation

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descendingly imbricate aestivation

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ascendingly imbricate aestivation

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Solution

The correct option is C
descendingly imbricate aestivation

Papilionaceous flowers (from Latin: papilion, a butterfly) are flowers with the characteristic irregular and butterfly-like corolla found in many, though not all, plants of the Fabaceae family. A papilionaceous corolla has imbricate aestivation. The largest (standard) overlaps the two lateral petals (wings) which in turn overlap the two smallest anterior petals (keel).

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