What do belladonna rhubarb dogbane jack in the pulpit plants have common?

All of these plants are poisonous to humans. Belladonna, also known as deadly nightshade, contains atropine and scopolamine, which can cause hallucinations, delirium, and death. Rhubarb contains oxalic acid, which can cause kidney stones and other health problems. Dogbane contains several toxins, including cardiac glycosides, which can cause heart problems. Jack in the pulpit contains calcium oxalate crystals, which can cause skin irritation and other problems.