Rafflesia doesn't have leaves, doesn't have a stem, and doesn't have roots. The whole plant is just one enormous flower. For most of its life it lives hidden inside the roots of another rainforest vine, like a secret passenger, sneakily taking food from its host. Only when it is ready to bloom does it suddenly pop a fat brown bud through the bark, like a giant cabbage.
It takes the bud about nine months to grow - the same time as a human baby. Then, over just a few days, it slowly unfolds into a huge red flower. The bloom only lasts about five days before it goes black and dies. So if you spot one in flower, you are very lucky.
Here is the cheekiest bit: the flower smells of rotting meat. Children who have smelled it say it's like old socks left in a wet bag, mixed with last week's bin. There's a clever reason. The smell attracts flies, who think they have found a dead animal. They crawl all over the flower looking for somewhere to lay eggs, and as they do, they carry pollen from flower to flower.
Rangers in Malaysia's rainforests keep a careful eye out for new buds and tell visitors when one is about to open. People travel from all over the world to see one in bloom. Just don't stand downwind.