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Papilionaceous flowers are flowers with the characteristic irregular and butterfly-like corolla. A single, large upper petal is known as the banner or vexillum and the name has been derived from an ancient military standard.

1. Papilionaceous flowers have regular corolla.
2. Papilionaceous flowers have no vexillum.
3. Papilionaceous flowers are flowers with the characteristic irregular and butterfly-like corolla.
4. Papilionaceous flowers are not found in Fabaceae.

Correct answer: Papilionaceous flowers are flowers with the characteristic irregular and butterfly-like corolla.

Solution

Papilionaceous flowers are characterized by an irregular, butterfly-like corolla, typically with a large upper petal called the vexillum or banner. This matches the correct option exactly.

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