The standard petal of a papilionaceous corolla is also called:
Carina
Pappus
Vexillum
Corona
Types of Corolla -
It can be following types
Cruciform - 4 petals are arranged like a cross eg: members of Brassicaceae
Papilionaceous - five petals are arranged with one largest petal called vexillum eg - Pea
Rosaceous - It consists 5 or more petals, lower part (claw) are absent and outer part (limb) are spreading outwards. eg: Rose, Coconut
Caryophyllaceous - Five free long clawed with limbs spread at right angle to claws. eg: Dianthus
Tabular: like tube eg: sunflower
funnel-shaped or Infundibuli form - eg: Datura
Bilabiate :Like upper & lower lips are formed by fusion of petals eg: Leucas
Rotate or wheel shaped - eg: brinjal
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The largest petal of papilionaceau is vexillunm
Option 1)
Carina
Incorrect option
Option 2)
Pappus
Incorrect option
Option 3)
Vexillum
correct option
Option 4)
Corona
Incorrect option