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The standard petal of a papilionaceous corolla is also called:

1. Carina
2. Pappus
3. Vexillum
4. Corona

Correct answer: Vexillum

Solution

In a papilionaceous corolla, the large outer upper petal is called the vexillum, or standard. The keel is the carina, so the standard cannot be carina, pappus, or corona.

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