It is Araujia sericifera, white bladderflower, cruel vine. -Here in California, it is a weedy non-native. Here is a link that might be useful: Araujia sericifera, white bladderflower, cruel vine

IMHO, you can't beat Mandevilla vines for the type of conditions you are suggesting!

Horticulturists concur with Tim. The names are used interchangeably, but the plants perform very differently. The fragrant one (which looks much frillier, and has different colors on each blossom) seems to have a short bloom season and be a bit fussy. The lavender one grows here with great vigor (though it did not appreciate a week of 22*). The bloom is solid lavender, not as long and twirly, and I can't detect any fragrance at all. The seeds are also different (explain THAT, taxonomists!) Fragrant Corkscrew Vine has flat black seeds 1/4" across. Lavender Snail Vine has tiny speckled brown bean-type seeds in 6" very skinny pods. I just bought Corkscrew Vine plants on ebay and will keep them indoors over the winter. Maybe I'll discover something by spring. The foliage may look the same, but too much else is different. The search goes on....

Well ken, why didn't you just write that in the earlier post? This: are there perennial morning glory??? [or is this one of those that is annual for me.. and perennial in more temperate areas?] too lazy to look it up.. bear with me ... Didn't give the impression of your later post's statement: i was trying to make the OP ... original poster ... go out there and observe ... If you wanted details of the vine's trunk from the OP, why not just say that is what you wanted? Instead it is hoops and goose chases... fakes and feints... Most of us that take the time to reply to queries in this forum are trying to assist the posters and address anyone's follow-up questions. It is a waste of our time to be asked questions when you are not even interested in receiving the answers.