weakness, spasms, hypertension , severe convulsions, and death. Podophyllum peltatum (commonly known as mayapple ). Green portions of the plant, unripe fruit, and especially the rhizome contain the non-alkaloid toxin podophyllotoxin , which causes diarrhea, severe digestive upset. Poison hemlock - see Conium maculatum . Poison ivy - see Toxicodendron .