Slow Flower

A Slow Flower is a type of flower found in Super Paper Mario. If one of the 4 heroes (Mario, Luigi, Bowser or Princess Peach) pick it up, everything will slow down for a short period of time. In addition to jumping and running slowly, Mario's flip meter will deplete and refill slower. Within that time, points and coins the heroes would earn will be tripled.

If an item that increases your points (such as a Gold Medal) is used, the points that Mario and his party receive will receive three times the points that they would have normally received.

The Speed Flower is similar to the Slow Flower, however instead it makes everything go faster.

Trivia
In Super Paper Mario, Chapter 3-3, The BigDot Tree. Get the Slow Flower which first appears in the very first part of the stage, pause(do this so the affect won't wear out), in the music you can slightly hear the theme of the Super Mario Bros. Music playing.