Re:New Tonga island 'now home to flowers and owls'
by pvaldes on Thursday February 07, 2019 @08:34PM
(#19110570)
Yes, is an exception to the rule, hence the "normally".
Convolvulaceae is a sister family to Solanaceae, and share their fondness for making some pretty evil alkaloids. Ipomoea (and other related genus) work often with lysergic acid derivatives. From LSD to vasoconstrictor or even gangrenous substances.
Note that Ipomoea batatas is sweet potato is a staple throughout the world and is very delicious, especially the purple-skinned, cream-fleshed variety. The young leaves can also be cooked and eaten.