This exotic blossom is growing in a hedge of weeds along my country road. Doesn't it look like an escapee from a tropical forest?
Coincidentally I was in Winston (at a charming garden/gift/foodie shop called the Li'l Briar Patch) and noticed an arbor covered with a plant with smooth green fruit, but no flowers in bloom. My friend said it was a passion flower.
Something clicked in my head. (Remember the synapse.) Was mine a passion flower?
Sure enough, wikipedia confirmed I'd found a passion flower. I went back out to "my" specimen. It had the vine and fruit. Today I'm going back out with a shovel and moving the North Carolina native to my yard where it will get an appreciative audience.