To be honest, I am not very knowledgeable if it comes to botanical things. However, "ipomoea grandiflora" seems to be an outdated term which has been (wrongly) applied to a multitude of Convolvulaceae. Check out this discussion: https://davesgarden.com/community/forums/t/986703/#b
So no way to tell whether or not you are looking at the right plant, sorry.
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