Conium maculatum (Hemlock): Neuralgia, rheumatism

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For example, hemlock (Conium maculatum) is recommended as a natural treatment for neuralgia and rheumatism, but ingestion of hemlock by pregnant sheep, goats, cattle, or pigs (shown here) can cause cleft palate and congenital joint contractures in the offspring.

Image credit: University of Pennsylvania, School of Veterinary Medicine (http://cal.vet.upenn.edu/poison/index.html)