Piranha Plants (also known as Piranha Flowers and Piranhas and misspelled as pirana plants in early manuals and Pirahna Flower) are large, carnivorous plants appearing throughout the Super Mario franchise. They are seemingly based on Venus flytraps and eat anything that approaches them. The head of a Piranha Plant is most commonly either red or green with multiple other colors.
Source: https://www.mariowiki.com/Piranha_Plant