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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

Scientific Name: Rheum rhaponticum

Common Name: Rhubarb

Species Most Often Affected: goats, humans, swine, horses

Poisonous Parts: leaves

Primary Poisons: anthraquinones, oxalate

Questions possibly pertaining to Rheum rhaponticum:

Could you give me some information about the toxicity of these plants?

Are these plants really poisonous?

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