These systems use this circumscription : order Ranunculales : family Berberidaceae : family Circaeasteraceae : : -LSB- + family Kingdoniaceae -RSB- : family Eupteleaceae : family Lardizabalaceae : family Menispermaceae : family Papaveraceae : : -LSB- + family Fumariaceae -RSB- : : -LSB- + family Pteridophyllaceae -RSB- : family Ranunculaceae Note : '' + ... '' = optional segregrate family , that may be split off from the preceding family .

Of necessity it contains the family Ranunculaceae , the buttercup family .
