Which is the largest flower?

The Rafflesia arnoldii, found in the rainforests of Southeast Asia, produces the largest individual flower in the world, reaching up to about one metre across and weighing up to 11 kilograms. It is a parasite with no leaves, stems, or roots of its own, living hidden inside a host vine until it blooms. To attract the flies that pollinate it, the flower emits a powerful stench of rotting meat, earning it the nickname corpse flower. Its blooms last only a few days.