I’m sure there is a factual answer to this question, although I will smile upon snarky and/or sarcastic answers if they amuse me.
I’m in northwestern Illinois. I encountered this flowering vinethis afternoon. The flowering portions are about 6 inches long, including the blooming, not-yet-blooming, and already-bloomed portions. The leavesranged from 3 to 6 inches across, and as wide.
I’ve never seen kudzu before; at least, I’ve never been aware of it. I didn’t know it grew this far north. It had grown thickly over the concrete wall where I saw it, though. It appeared vigorous and healthy.