Looks correct for gastonis-bonnieri to me. Have you fed it on steroids?
Is the 4 feet including the flower stem? Plants don't always behave as people say, I don't know if it's supposed to die but if it is maybe it needs to live a little longer to reproduce.
http://www.mgonlinestore.com/K...
smgrowers say the mother plant "declines" after flowering.
http://www.smgrowers.com/produ...