'Dwarf Pink Singapore' has been in existence for many years, it is a true dwarf with cute, small leaves. There are a few other old stalwarts that are very compact such as Penang Peach.
The Thai hybridizers, most specifically Jungle Jack, have recently been creating many smaller varieties that are perfect to be displayed in pots.
Check out
http://www.junglejacksplumeria... Under 'Galleries' it will list compacts and miniatures.
