Rafflesia arnoldii, corpse flower
Rafflesia arnoldii produces the largest individual flower in the world. You might be impressed by one, until you got close enough to take a whiff. The nickname it shares with titan arum, corpse flower, tells you everything you need to know about its aroma. As with several other foul-smelling blooms, the scent is designed to smell like rotting carrion to attract flies. Despite its unsavory stench, Rafflesia arnoldii is considered one of the three national flowers in Indonesia, where it is a protected species. When it's not delivering its stinky odor, it actually makes a beautiful bloom. The other good news is that since it's such a large flower (blooms can be 3 feet in diameter!), there won't be any question where the bad smell is coming from.