From the Super Mario Wiki
Sad Nipper Plants (abbreviated Sad N. Plants) are enemies found on Vibe Island in the Nintendo DS game Super Princess Peach. Sad Nipper Plants attack like normal Nipper Plants, but they tend to attack at random. Also, Sad Nipper Plants can be differentiated from that game's standard Nipper Plants in that they jump in an arch while the normal Nipper Plants jump straight upward. According to the game's Glossary, this plant "attacks foes without a thought since it's so sad."