After some searching I think Vigna Caracalla is the scented 'Corkscrew Vine'. The flowers are totally different on these two vines, so the unscented one must be the snail vine.

I meant to do some research on this but I can to a dead end. I will say this. I have it growing and I have the fragrant one. I bought my original plaqnt from Monticello. Jefferson's Monticello is where I originally saw this plant and the aroma is sensed long before the plant is seen. I have had mine 5 years and each year it produces more blooms and the intensity of the fragrance also increases. So I would suggest you order from them because I knoww it is fragrant. They also root very easily and mine produces a small amount of seed each year. Rodger

Here is a link that might be useful: Vigna Caracalla

Thanks Roger, I did a crosspost on the vine forum and think I've got it sorted out now. The right name for the fragrant one is Vigna Caracalla according to this.... I have to wait a bit to see which one I actually have.

Annette

Here is a link that might be useful: Corkscrew or Snail