World’s Largest Flower, Rafflesia Arnoldii. Diameter of about one meter and weighing up to ten kilograms. It's rare & not easily located, growing once a year, blooming for 5 days. The flower looks and smells like rotting flesh & is related to violets, poinsettias & passionflowers. It's nickname is “meat flower” or “corpse flower”. Found in Indonesian rain forests of southeastern Asia and Philippines.