Janet, thanks for that link. I could only get the Australian distribution. Funny how it misses Cape York Peninsula. I wonder if that might just be a data deficiency situation.
They have a tuber, so my plant might have come from one of those. But I did leave some Convolvulaceae seedlings from what sprouted in the new soil, I remember one was interesting because it came up so much larger than usual. So it might have been that. Just hope it isn't a weedy type and tries to take over. I'm happy to have a few around. And it's interesting to have another "winged" plant. I've grown Winged Yam and Winged Bean before, and now a winged morning glory.