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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.

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Scientific NameCommon Name(s)Species Most
Often Affected
Parts PoisonousPrimary Poison(s)
Amaranthus spp.Pigweedcattle, swineleavesnitrate
Amsinckia intermediaFiddleneckhorses, swine, cattleseedsintermedine, lycopsamine
Brassica spp,Rape, Cabbage, Turnips, Broccoli, Mustardcattle, humans, swine, sheep, goats, poultryroots, seedsglucosinolates, brassica, anemia factor
Chenopodium albumLambs Quarterscattle, horses, humans, sheep, swineallnitrates
Iris spp.Irisescattle, humans, swinerhizomes and rootstocksirisin, iridin, or irisine
Laburnum anagyroidesGolden Chain, Laburnumcattle, dogs, horses, humans, swinepods, seeds, allcytisine
Nicotiana spp.Tobacco, Tree Tobaccohumans, swineleavesnicotine,pyridine
Phytolacca americanaPokeweedcattle, sheep, humans, turkeys, swine, horsesallphytolaccatoxin, phytolaccigenin
Podophyllum peltatumMayapple, Mandrakecattle, humans, swineallalpha- and beta- peltatin, podophylloresin
Prunus spp.Wild Cherries, Black Cherry, Bitter Cherry, Choke Cherry, Pin Cherryhorses, cattle, moose, sheep, swine, goatsseeds, leavesamygdalin, prunasin
Pteridium aquiliniumBracken Fernhorse, cattle, sheep, humans, swineallprunasin, ptaquiloside, thiaminase
Rheum rhaponticumRhubarbgoats, humans, swine, horsesleavesanthraquinones, oxalate
Xanthium strumariumCockleburcattle, humans, rodents, swineseedlings, seedscarboxyatractyloside