Thank you all. I really think it is just dumb luck! I have several plants that bloom continuosly that I really don't think are supposed to (but don't tell them that)
I've tried breaking off a piece of this for a friend, but it has yet to come into bloom ?!
My dark form blooms quite frequently ... though periodic traumatic events -- like completely drying out because I have too many other things to do at the time -- do cause an end of blooming for a bit.