BUCKLER-MUSTARD, or Bastard Mithridate-mustard; a genus of the tetradynamia order, belonging to the filicifera class of plants. Of this there are three species; the auriculata, with small pods joined to the style; the didyma, with a double orbicular pod diverging from the style; and the apula, with flowers growing in spikes and a shorter style. They are natives of France, Italy, and Germany.