Not sure about cucumber. Doesn’t have that hairy texture like a cucumber. Looks more like a morning glory. The heart shaped leaves are most common, but for the wild plants, I have seen varied leaf shapes. http://www.garden.org/weedlibrary/?q=show&id=2400
I’ll be leaning with roypaul on this one. He is certainly correct on the hairy texture of cucumber. I’ve often been warned that eating too much crow can hurt your eyes! Morning glory looks good for the ID as well. Nice blooms should be coming soon!
This looks much like a weed that is growing here. Some farmers call it a potato weed, because it looks like a sweet potato plant. I think it may be a bindweed or wild buckwheat vine. It has clusters of white fuzzy looking blooms. Not sure but it could be the same.