This is not the beheaded one, just to be clear! ;)
But it is one of my self-grown ones (I don't have any other adeniums anyway) and it's flowering reliably every summer.
However, equally reliably, it grows several flower buds and then lets at least two of them dry up before growing a "decent" one that will open eventually.
I still haven't figured out why it does that or how I can prevent this. But, we're working on it.
Two Adenium obesum flower buds on July 18, 2012
Normal and dried up Adenium flower bud on July 18, 2012