Xmas cactus, also known as Schlumbergera bridgesii, is a houseplant with distinctive red or pink flowers that bloom during the holiday season. It's not inherently poisonous, but ingesting its parts, such as the flowers or leaves, can cause stomach upset or discomfort in some individuals. As with any houseplant, it's important to keep it away from curious pets or young children who may be tempted to taste or chew on it. If you suspect someone has ingested parts of a Xmas cactus, seek medical attention immediately.