Indeed, Thevetia peruviana (formerly T. neriifolia) has three distinct color forms. I have not seen any substantial variation of any of the colors, nor gradations between. If self-pollinated, the white form comes true from seed. I'm not certain if the yellow and pink ones will, but I would bet that they probably do as well. Since vegetative propagation of this plant is difficult, growing the rarer white and pink forms in isolation (from the other colors) would likely result in seed production of the desired color form.
Los Angeles, CA USA
--- On Mon, 8/24/09, Naresh Pancholi <abrp...@gmail.com> wrote: