Help with plant ID

I give up, time to ask the experts.

I've just received some cuttings from a nameless, jasmine-like plant. I haven't seen the mother plant, but have been told that it is now being grown as a hanging vine, with clusters of several individual flowers on the terminal ends. I was given an individual flower but was unable to get a picture before it faded.

The dime-sized, star-shaped flower is composed of 5 white petals that open and appear very much like a tiny balloon flower. The inner ring of 5 purple stamens (nectuaries?) is also star shaped, about the size of a pencil eraser. The leaves are opposite and slightly deltoid, and emit a white, latex-like sap when broken at the stem. Fragrance appears to be absent or slight.

I've looked through 50 pages of Google results using star flower or star-shaped and am at a loss. Would appreciate any tentative ID's or pointers.

Thanks
--
Frank Dutra, Nantucket Island, Zone 7 maritime.

<mailto: Frank@NantucketHydrangea.com>

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