Which of these is an example for zygomorphic flower with imbricate aestivation ?

What is imbricate aestivation ?

Which of these is an example for a zygomorphic flower with diadelphous stamen and marginal placentation:

A flower zygomorphic when

What is zygomorphic flower ?

How many of the following shows zygomorphic flowers with valvate/imbricate aestivation? Indigofera, Lupin, Petunia, Aloe, Colchicum autumnale, Sesbania, Trifolium, Solanum

How many of the following shows zygomorphic flowers with valvate/imbricate aestivation? Indigofera, Lupin, Petunia, Aloe, Colchicum autumnale, Sesbania, Trifolium, Solanum

What are zygomorphic flowers?