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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)
Acer rubrumRed maple, Swamp maple, Soft maplehorsesleavesgallic acid
Allium spp.Commercial Onions, Wild Onions, Swamp Onions, Chivescattle, horses, childrenbulbs, lleavesSMCO
Amsinckia intermediaFiddleneckhorses, swine, cattleseedsintermedine, lycopsamine
Apocynum spp.Dogbanehorses, cattle, humans, sheep, cats, dogs, goatsrhizomeapocynamarin
Chenopodium albumLambs Quarterscattle, horses, humans, sheep, swineallnitrates
Datura spp.Jimsonweed, Downy Thornapple, Devils Trumpet, Angels Trumpetcattle, humans, horses, goatsflowers, leaves, seedsatropine, scopalamine, and hyoscyamine
Digitalis purpureaFoxglovecats, cattle, dogs, goats, horses, humansflowers, leaves, seedscardiac or steroid glycosides
Eupatorium rugosumWhite Snakerootcattle, dogs, goats, horses, humans, rabbits, sheepalltremetone
Euphorbia spp.Poinsettia, Spurges, Snow on the Mountaincattle, horses, humans, sheepleaves, stems and sapphorbol esters
Fagoypyrum esculentumBuckwheathorses, goats
Festuca arundinaceaTall Fescuecattle, horsesalldiaziphenanthrene, pyrrolizidine, and ergot
Gelsemium sempervirensJessaminehorses, goatsallgelsemine
Glechoma spp.Ground Ivy, Creeping Charlie, Gill over the groundhorses, goatsleaves, stemsunknown
Hypericum perforatumSt. Johns Wort, Klamath Weedhorses, sheep, goatsallhypericum
Laburnum anagyroidesGolden Chain, Laburnumcattle, dogs, horses, humans, swinepods, seeds, allcytisine
Lathyrus spp.Sweet Pea, Tangier Pea, Everlasting Pea, Caley Pea, Singletary Peahorses, rodents, turkeys, sheep, humansseedsDABA, ODAP, amine, phenol, glycoside
Metilotus alba and Melilotus officinalisWhite Sweetclover, Yellow Sweetcloverhorses, cattle, sheepstemdicoumarol
Nerium oleanderOleanderhorses, cattle, sheep, dogs, humans, goatsall, leaves, stemsnerioside, oleandroside, saponins, cardiac glycosides
Phytolacca americanaPokeweedcattle, sheep, humans, turkeys, swine, horsesallphytolaccatoxin, phytolaccigenin
Prunus spp.Wild Cherries, Black Cherry, Bitter Cherry, Choke Cherry, Pin Cherryhorses, cattle, moose, sheep, swine, goatsseeds, leavesamygdalin, prunasin
Ranunculus spp.Buttercup, Crowfootcattle, goats, horsesallprotoanemonin
Rheum rhaponticumRhubarbgoats, humans, swine, horsesleavesanthraquinones, oxalate
Robinia pseudoacaciaBlack Locusthorses, cattle, humans, poultry, sheep, goatsbark, leaves, seedsrobin, phasin
Solanum spp.Common Nightshade, Black Nightshade, Horse Nettle, Buffalo Bur, Potatocattle, humans, rodents, sheep, horses, goatsleaves, immature fruitsoladulcidine,solanine
Sorghum spp.Sorghum, Milo, Sudan Grass, Johnson Grasshorses, cattle, goatsleaves, stemsdhurrin, nitrate
Rheum rhaponticumRhubarbgoats, humans, swine, horsesleavesanthraquinones, oxalate
Vicia spp.Common Vetch, Hairy Vetch, Narrow leafed vetch, purple vetch, broad beanschickens, horses, humansseedsbeta-cyano-L-alanine
Acer rubrumRed maple, Swamp maple, Soft maplehorsesleavesgallic acid
Acer saccharumSugar maple, Rock maple, Hard maplehorsesleavesgallic acid
Acer saccharinumSilver maple, Soft maple, White maplehorsesleavesgallic acid