RE: Bells

https://erowid.org/herbs/foxglove/foxglove.shtml
https://erowid.org/plants/morning_glory/

I think what you got there is a foxglove, a digitalis, not a ipomoea.
The lesson?
Don't take peoples' word for things, they could be wrong.
They did get the 'poisonous' right, but they say that about ipomoea just to scare the kids away.