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.
RE: Bells