A primordium (/praɪˈmɔːrdiəm/; plural: primordia; synonym: anlage) in embryology, is an organ or tissue in its earliest recognizable stage of development.[1] Cells of the primordium are called primordial cells. A primordium is the simplest set of cells capable of triggering growth of the would-be organ and the initial foundation from which an organ is able to grow. In flowering plants, a floral primordium gives rise to a flower.