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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)
Aconitum spp.Monkshood, Aconite, Wolfsbanehumans, cattle, goatsleaves, roots, allaconitine
Aesculus spp.Horse Chestnut, Buckeyehumans, cattle, goatsfruitUnknown, possibly saportins, narcotic alkaloids, or glycosides.
Agrostemma githagoCorn Cocklepoultry, cattle, humans, goatsseedsgithagin
Apocynum spp.Dogbanehorses, cattle, humans, sheep, cats, dogs, goatsrhizomeapocynamarin
Arisaema spp.Jack in the Pulpithumansalloxalate
Atropa belladonnaBelladonna, Deadly Nightshadehumans, goatsallatropine and scopalamine
Brassica spp,Rape, Cabbage, Turnips, Broccoli, Mustardcattle, humans, swine, sheep, goats, poultryroots, seedsglucosinolates, brassica, anemia factor
Chelidonium majusCelandinecattle, humansrootsisoquinoline alkoids
Chenopodium albumLambs Quarterscattle, horses, humans, sheep, swineallnitrates
Convallaria majalisLily of the Valleycats, dogs, humans, goatsallcardiac glycosides and saponins
Daphne spp.Daphnecats, dogs, humansberries, allmezereinic acid anhydride
Datura spp.Jimsonweed, Downy Thornapple, Devils Trumpet, Angels Trumpetcattle, humans, horses, goatsflowers, leaves, seedsatropine, scopalamine, and hyoscyamine
Delphinium spp.Delphiniums, Larkspurscattle, humans, goatsallalkaloids delphinine, ajacine, and others
Dicentra spp.Bleeding Heart, Squirrel Corn, Dutchmans Breechescats, cattle, humansallisoquinolone alkaloids
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
Helleborus nigerChristmas Rosehumansallprotoanemonin
Hyoscyanamus nigerHenbanehumansseedsatropine, scopolamine, and hyoscyamine.
Iris spp.Irisescattle, humans, swinerhizomes and rootstocksirisin, iridin, or irisine
Laburnum anagyroidesGolden Chain, Laburnumcattle, dogs, horses, humans, swinepods, seeds, allcytisine
Lantana camaraLantana, Red Sage, Yellow Sage, West Indian Lantanacattle, dogs, goats, cats, humans, sheepunripe, green berriestriterpenes
Lathyrus spp.Sweet Pea, Tangier Pea, Everlasting Pea, Caley Pea, Singletary Peahorses, rodents, turkeys, sheep, humansseedsDABA, ODAP, amine, phenol, glycoside
Lobelia spp.Great Lobelia, Cardinal Flower, Indian Tobaccohumans, goatsalllobelamine, lobeline
Medicago sativaAlfalfa, Lucernecattle, chickens, humans, sheepallcanavanine, saponins
Menispermum canadenseMoonseedhumans, goatsalldauricine
Nerium oleanderOleanderhorses, cattle, sheep, dogs, humans, goatsall, leaves, stemsnerioside, oleandroside, saponins, cardiac glycosides
Nicotiana spp.Tobacco, Tree Tobaccohumans, swineleavesnicotine,pyridine
Ornithogalum umbellatumStar of Bethlehemhumansbulbs, flowers, allconvallatoxin, convalloside
Papaver spp.Various Poppies including Opium Poppycattle, humansallcodine, morphine, protopine
Phytolacca americanaPokeweedcattle, sheep, humans, turkeys, swine, horsesallphytolaccatoxin, phytolaccigenin
Podophyllum peltatumMayapple, Mandrakecattle, humans, swineallalpha- and beta- peltatin, podophylloresin
Pteridium aquiliniumBracken Fernhorse, cattle, sheep, humans, swineallprunasin, ptaquiloside, thiaminase
Rheum rhaponticumRhubarbgoats, humans, swine, horsesleavesanthraquinones, oxalate
Robinia pseudoacaciaBlack Locusthorses, cattle, humans, poultry, sheep, goatsbark, leaves, seedsrobin, phasin
Sambucus canadensisElderberrycattle, humans, goatsleaves, twigs, roots, unripe fruitssambunigrin
Senecio spp.Senecio, Groundsels, Ragworthorse, cattle, goats, sheep, humanleavesjacobine, seneciphylline
Solanum spp.Common Nightshade, Black Nightshade, Horse Nettle, Buffalo Bur, Potatocattle, humans, rodents, sheep, horses, goatsleaves, immature fruitsoladulcidine,solanine
Symplocarpus foetidusEastern Skunk Cabbagehumanalloxalate
Rheum rhaponticumRhubarbgoats, humans, swine, horsesleavesanthraquinones, oxalate
Toxicodendron diversilobaPoison oakhumans
Toxicodendron radicansPoison ivyhumans
Toxicodendron vernixPoison Sumachumans
Urtica spp.Stinging Nettledogs, humanshairsacetylcholine, histamine, 5-hydroxytryptamine
Vicia spp.Common Vetch, Hairy Vetch, Narrow leafed vetch, purple vetch, broad beanschickens, horses, humansseedsbeta-cyano-L-alanine
Wisteria spp.Wisteriahumansall, flowers, seeds, leaveswistarine
Xanthium strumariumCockleburcattle, humans, rodents, swineseedlings, seedscarboxyatractyloside