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Mandevilla sp
Edwards Botanical Gardens, Ontario, Canada
Ornamental Tobacco plants come in many colours and are used as summer bedding, the white form Nicotiana sylvestris is very sweetly perfumed.
It's definitely not Periwinkle http://en.wikipedia.org/wiki/Periwinkle_... If you check the leaves and form in your photo you will see that it's not the same : )