Early stages of development of flowers and inflorescences. A, B. Early stages of initiation of the inflorescence. Arrowhead, adnation of spathe (removed) at the base of the inflorescence. Scale bars = 188 μm (A); 375 μm (B). C. Acropetal initiation of more or less circular floral primordia along the spadix. Scale bar = 375 μm. D. Stage at which unisexual floral primordia begin to form their floral organs. F, female zone. I, intermediate zone. M, male zone. Scale bar = 375 μm.