Related Videotape at http://gardenofeaden.blogspot.com/2011/06/what-is-biggest-flower-in-world.html
Amorphophallus titanum (Araceae), also called "cadaverous flower" .
The largest flower in the world was blooming in Blanco , Veracruz , Mexico . Two meters (6 5/8 feet) high and weighing 75 kilos (165 1/3 lbs). It has the peculiarity of blooming only during three days every 40 years.