Rhubarb leaves poisoning occurs when someone eats pieces of leaves from the rhubarb plant.
The leaves (leaf blade) of the rhubarb plant. The stalk can be eaten.
Caravati EM, et al. Natural Toxins. In: Dart R, et al, Medical Toxicology. 3rd ed. Philadelphia, PA: Lippincott, Williams & Wilkins; 2004:chap 215.