I looked into it a bit last year and learned that my zygocactus, also known as schlumbergera, is a Thanksgiving or crab sort, not a Christmas cactus (hence it is about done blooming). Mine also tends to flower in spring, often around Easter, and sometimes again in summer. I guess it likes the bay window.
Both the Thanksgiving and the Christmas Cactus fall under the genus Schlumbergera which I learned as Schlumbergia years ago. The Thanksgiving Cactus has little spine-like notches coming off it’s leaves (just like a crab claw hence that common name) whereas the leaves of the Christmas Cactus are smoother. The Thanksgiving Cactus is timed to flower in November/December whereas it’s December/January for the Christmas Cactus. —From How to Grow Christmas Cactus
Today was day for learning: in addition to learning that my “Christmas Cactus” was actually a “Thanksgiving” or “crab” cactus, I learned how to ftp into my currently under construction wordpress.org account, and how to fix the mysterious problem of the disappearing posts within it. I am so-o ready for a good night’s sleep.