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The standard petal of a papilionaceous corolla is also called
(1) vexillum
As per NCERT, a papilionaceous corolla has five petals: the largest posterior one is the standard (vexillum), two lateral ones are wings (alae), and two anterior fused ones form the keel (carina).
⇒ This arrangement is called vexillary aestivation.
∴ The standard petal is the vexillum.
Answer: (1)
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