Deku Flower

From Zelda Wiki.org

The Deku Flower appears in The Legend of Zelda: Majora's Mask. It can be only used while wearing the Deku Mask, and allows Deku Link to fly around using two flower-helicopters. This effect is only temporary; after some time you stall and fall.

There are two different types of Deku Flowers; pink (the normal) and yellow. Yellow flowers allow you to go further and higher than using the pink, and are inhabited by Business Scrubs. The Deku Flower plays a important role in various temples (especially the Woodfall Temple) and is used in-game to reach places that often hold items such as heart pieces.

It is also very important in the Deku Scrub Playground which is an entire mini-game that uses the Deku Flower to get from platform to platform.