Morning Glories: Help with ID, 1 by hobbyodlaren

hobbyodlaren wrote:
This Ipomoea, which I start very late in the season now start to flower, the flower open up very early in the morning. When I look today at 6 o'clock it was open. It begin flower even that it is dark outside, the sun donīt went up here before 8.
Also the flower is only open about 5 hours!!!???
And I even donīt know if it start flower in the middle of the night neither.
It is a Ipomoea nil I think beacuse of the leaf. But which one? Thats the question.
Sylvia