Rheum rhaponticum
The leaves of garden rhubarb contain oxalic acid and other toxins which can cause poisoning. The chemical composition of the leaves is considerably different from that of the edible leaf stems. The leaf blades contain dangerous quantities of oxalic acid and soluble oxalates and have caused deaths when eaten as a vegetable, even when small quantities were consumed. Vomiting, fluctuating abdominal pains and weakness precede death. As a common garden plant, the dangers cannot be over emphasized.
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