is the floral formula of

• Allium

• Sesbania

• Petunia

• Petunia

C.

Petunia

Floral formula is of Solanaceae family, i.e. of Petunia, while Brassica is form Brassicaceae whereas, Allium belongs to Liliaceae and Sesbania is from Fabaceae family.
As characteristic features of Solanaceae are
(i) Inflorescence - Cymose
(ii) Flower - Ebracteate, actinomorphic, bisexual, pedicellate. 
(iii) Calyx - Sepals 5, gamosepalous, valvate aestivation. 
(iv) Corolla - Petals 5, twisted or valvate aestivation
(v) Androecium - Stamens 5, epipetalous. 
(vi) Gynoecium - Bicarpellary, syncarpous, axile placentation, superior ovary and bilocular, which is represented as floral formula.