These Piranha Plants first appeared in super mario kart in the course Choco Island 1 and 2. There are scattered around the track and even some in the mud. They snap their petals and don't move around.
Piranha Plants inhabit the quick sand funnels in Yoshi Desert on this game, and when a player is sucked into one, they are chomped by a Piranha Plant and spit out, losing time and precious Coins. Even though the two Choco Island courses appear as Retro Tracks, they are not armed with Piranha Plants.
Piranha Plants then appear in Mario Kart: Double Dash!! Mario Circuit, where there are a few of them on each side when turning a U turn, and they will bite you if you are too close to them. They also appear at the very end of the course. They acutally snap out at you, blocking your path. They also appear in Yoshi Circuit at more points, and are harder to avoid. Fake metal piranha plants appear in Waluigi Stadium. A big Piranha Plant is in the Dry Dry Desert.
They appear in the New Course Piranha Plant Slide and for the first time they have their own course.
They reappear in 3DS Piranha Plant Slide, and also are now an obtainable item.
Fake statued plants appeared in Falco Stadium. They seem to be made of wood and come out of pipes that are on their side in the halfpipe.