Whaterwheels are all most exactly like Bladderworts. The only 2 differances are, 1. they are in the shape of a waterwheel and 2. they have bigger bladders. They are a little less common than Bladderworts though. They also have flowers like Bladderworts too. Did you know that Waterwheels are actually thought to be a derect relative of the Venus Flytrap! -photo- http://www.sarracenia.com/photos/aldrovanda/aldrovesic014.jpg