Heavenly Blue Morning Glory

Ipomoea tricolor does NOT have trilobed leaves or any hair on the leaves , which therefore rules out Ipomoea tricolor completely...what is reasonably left is either Ipomoea nil or Ipomoea hederacea...based on the size and overall look of the corolla , I would say Ipomoea hederacea is the most likely..

Look at the upper half of the photo for best ID purposes... The stem and tri-lobed leaves are hairy and the flower is relatively small in relation to the leaves...the flower is a total match for Ipomoea hederacea...