I bought this plant today in a small nursery. He said the only name he knew it by was "Indian Carnation". It is fragrant in the daytime, extremely fragrant at night like a jasmine, has double white flowers and is a shrub not a vine. It's leaves are about 4-5 inches long, shiny, smooth and not stiff. It is hardy here in zone 10. I think it may be some kind of Tabernaemontana, maybe called a "Crepe Jasmine".