Grows wild in Argentina. the flowers smell like honey bee.
at least we would like to know which family belongs
From a friend
Just guessing on this one. Low probability and not confident!
Further research i would say Macrosiphonia longiflora.
I wonder where you can get this plant - if anyone knows, dmail me!!!
I've grown the white Mandevilla and mine didn't look like the O.P.'s pictures. After searching for Macrosiphonia longiflora. I don't see the plant offered here in the USA.
the name Macrosiphonia is a considered by some to be a synonym of Mandevilla. See Simoes, et al, Novon 2007
Ok, I finally found an image for Mandevilla longiflora: