It looks like some type of hibiscus, but I have never seen one like it. Does it make seed? Very pretty.
The thing about this flower is that the petals are flat, not like the hibuscus that's curled a bit. the bloom is like the regular size of a hibiscus.
It sort of reminds me of my Red Texas Star hibiscus, except the flowers are a bit more fancy and the plant itself is not a creeper as you describe yours. I'd love to get some seeds of your plant.