Schlumbergera. See more pictures of cacti.
Most of them are epiphytic (grow high in trees) and have no spines. They have flat, jointed leaves that grow in chains one to two feet long. The flowers range in color from white through rose, red, lavender, and purple.
They need short days (eight hours) or cold nights (55°F) for flowering. Give schlumbergera filtered to bright light and organic soil with good drainage. Keep the plants evenly moist while they are actively growing, and drench and let dry during their resting period. If the soil gets too dry, the end joints drop off; if it gets too wet, the plant will rot.
Caring for your cactus: