Transcription factor that promotes early floral meristem identity in synergy with LEAFY. Displays a redundant function with CAULIFLOWER in the up-regulation of LEAFY. Required subsequently for the transition of an inflorescence meristem into a floral meristem, and for the normal development of sepals and petals in flowers. Regulates positively B class homeotic proteins (By similarity). Homodimer capable of binding to CArG-box sequences.