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Answer: 3. Vexillum

Key idea: In a papilionaceous corolla (pea family), the large back petal is the standard or vexillum.

There are two lateral wing petals and two fused lower petals forming the keel (carina). Pappus is the modified calyx of Asteraceae, and corona is an outgrowth of petals in flowers like Calotropis.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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