Grows wild in Argentina. the flowers smell like honey bee.
at least we would like to know which family belongs
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: