Rafflesia flowers can measure 3 feet across — the biggest flowers of any plant. They also have another distinguishing characteristic. What is it?
-TimK
Yup!
They are the smelliest flowers, reeking of rotten meat. This is a trick designed to attract flies for pollination.
Take it away, Kimb3rlyAl3xis! 
-TimK
Re: #5 The World's Biggest Flowers
The other characteristic is that it smells like rotting meat!