The family containing mustard and its main characters are:
- ABrassicaceae - Tetramerous flowers, six stamens, bicarpellary gynoecium, siliqua type fruit
- BBrassicaceae - Pentamerous flowers, many stamens, pentacarpellary gynoecium, capsule type fruit
- CSolanaceae - Pentamerous flowers, five stamens, bicarpellary gynoecium, berry type fruit
- DPoaceae - Trimerous flowers, three stamens, monocarpellary gynoecium, caryopsis type of fruit.