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Bloodroot Black henbane  Hyoscyamus niger Barbados nut  Jatropha cucas Belladonna Atropa belladonna Bouncing Bet Bracken or Brake Fern Both cattle and horses are susceptible to bracken fern poisoning.  Buttercup (Ranunculus spp.) Buckwheat Fagopyrum sagittatum Box elder Acer negundo