What is this vine? It's located in Atlanta, GA. It has been flowering for the past several months. The photos were taken in late August, 2020. The flowers on this vine seem to be particularly attractive to bumble bees as there are always about a dozen of them on this vine's flowers whenever I visit it.
One feature of this vine's flowers that I find particularly interesting are the pieces that come up from the middle, go outwards, and then appear to end in wide brushes that are positioned at the same height as a bumble bee's back when they're visiting the flower. I assume these brushes are used to apply pollen to the bumble bee's back. Is that correct?
These flowers also have three purple/green segments at the top of the flower that go out from the center. What are those, and what are they used for?