What-s the world-s largest flower?

The flower with the world's largest bloom is the Rafflesia arnoldii.

The blossom with the world's biggest sprout is the Rafflesia arnoldii. This uncommon blossom is found in the rainforests of Indonesia. It can develop to be 3 feet across and weigh as much as 15 pounds! It is a parasitic plant, with no noticeable leaves, roots, or stem.