Amorphophallus titanum
Rare and one of the largest flowers in the world they can reach 10 feet, this was taken at Kew Gardens in 2003, I included the people to give it some perspective. It has a very unpleasant fragrance like rotten meat and fish.
Italian botanist Odoardo Beccari discovered the Titan Arum in Sumatra in 1878. He sent seeds to England's Royal Botanic Gardens in Kew, where the first bloom of this species in cultivation occurred in 1889.