Rafflesia is the world’s largest flower, found naturally in South East Asia. There are 27 species of Rafflesia; the largest is Rafflesia arnoldii, which could grow over 100cm in diameter and 10kg in weigh [wiki]
Rafflesia is infamous for its rotten-meat like smell; but I’ve seen the flower twice on different occasions and never smelled anything that resembled the fact.
Sharing a few Rafflesia photos from Poring in Kinabalu National Park during my Sabah trip in March 2009; the bloomed Rafflesia I saw was about 60-70cm in diameter…

The flower bud; according to our guide it takes about three to four weeks for a new bud to start blooming, and the flower would bloom for about a week…

Rafflesia completed it blooming cycle, literally dead…

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largest, and maybe the ugliest too =P
lol, this flower makes me wanna throw up. =P
well if it’s as stinky as they say [but as you've stated you have yet to encounter its infamous smell], it really deserves the award for ugliest flower.
hi
adrianna : )