What's WEIRD about the Rafflesia is that it exists in a state VERY SIMILAR to fungus; like mycelium, the flowers true form is a mass of stuff under the bark of its host tree that it leeches nutrients from (thats right boys, parasitic).
It has actually LOST most things that would make it similar to other plants, including the ability to make chlorophyll!
What's sad is that there are around 41 varieties of this flower, and they are all endangered, because you don't know if a tree has it until it blooms, and they do not bloom very often or for very long. So trees get cut down that have them, and you'd never know.
And we cannot grow them from seed (they cannot self-pollinate if i remember correctly, you need 2); the natural process is just too sensitive/complicated right now, so we've been grafting infected host vine to uninfected to propagate.
And even then, we won't know for sure it took until it blooms... which could be a while.
Also, they're related to passion flowers!