From the Super Mario Wiki
The Sad N. Plant (short for Sad Nipper Plant) is an enemy found on Vibe Island in the Nintendo DS game Super Princess Peach. They attack like normal Nipper Plants, but they tend to attack at random. Also, they 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."
- ^ Super Princess Peach Glossary