From the Super Mario Wiki
Dizzy Dandies are mischievous flowers that resemble normal Flowers in Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3 and Yoshi's Island DS. When Yoshi approaches them, they may drop to the ground rolling very quickly, squashing any enemies, and possibly hurting Yoshi. They are defeated when they ram into a wall.
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