I just got through looking at a bunch of pictures of this plant through a Google search. And very many of them do not look like the picture that you have posted. What appealed to me was the little short fat segments with the dark colored edges. And about three quarters of the pictures that I'm seeing through a Google search do not have the short fat segments (longer segments and not quite so fat) and they do not have the dark colored edges. Is there a subspecies to the specimen that you have?
And thanks again for the name. You started me off in a relatively new Direction. I have a couple of euphorbias, and will not object to acquiring one more.