I orginally posted this request but just found 2 more photos which may help to identify it. It does have the white milky substance and only cascades, not upright at all. Grows and grows till it drags the floor. Very easy to propagate. Doesn't tolerate full summer phoenix, AZ sun but winter sun ok. Thanx for your help.
I think it's an Asclepiad, but I can't recall which... Sarcostemma? Cynanchum?
I have replied on the original thread. Please see: http://davesgarden.com/community/forums/t/1338751/ My guess is Sarcostemma stolonifera but I won't repeat my reason here as you can read that on the link.