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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: Quercus spp.

Common Name: Oak Trees

Species Most Often Affected: horse, cattle

Poisonous Parts: acorns, young leaves

Primary Poisons: gallotannins, quercitrin, and quercitin

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