Whorls of flower

Every flower is built from two functional sets of whorls arranged around the receptacle. The accessory (non-essential) whorls are the calyx and the corolla, whose job is mainly protection and pollinator attraction. The essential whorls are the androecium and the gynoecium, which actually carry out sexual reproduction. A flower bearing all four whorls - calyx, corolla, androecium and gynoecium - is called co …