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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
Allium spp.Commercial Onions, Wild Onions, Swamp Onions, Chivescattle, horses, childrenbulbs, lleavesSMCO
Amaranthus spp.Pigweedcattle, swineleavesnitrate
Amsinckia intermediaFiddleneckhorses, swine, cattleseedsintermedine, lycopsamine
Apocynum spp.Dogbanehorses, cattle, humans, sheep, cats, dogs, goatsrhizomeapocynamarin
Asclepias spp.Milkweedsheep, cattle, goatsleaves, fruits, stemsdesglucosyrioside, syrioside
Astragalus and Oxytropis spp.Locoweedhorse,sheep, cattleflowers, leaves, stemsselenium, nitro compounds, swainsonine
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
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
Festuca arundinaceaTall Fescuecattle, horsesalldiaziphenanthrene, pyrrolizidine, and ergot
Halogeton glomeratusHalogetonsheep, cattleleaves, stemssoluble oxalates
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
Linum usitatissimumFlaxcattle, sheepallcyanogenic glycoside
Lotus corniculatusBirdsfoot Trefoilcattle, sheepCN tannini
Lupinus spp.Lupinecattle, goatsseedslupinine, anagyrine, sparteine, and hydroxylupanine
Medicago sativaAlfalfa, Lucernecattle, chickens, humans, sheepallcanavanine, saponins
Metilotus alba and Melilotus officinalisWhite Sweetclover, Yellow Sweetcloverhorses, cattle, sheepstemdicoumarol
Nerium oleanderOleanderhorses, cattle, sheep, dogs, humans, goatsall, leaves, stemsnerioside, oleandroside, saponins, cardiac glycosides
Papaver spp.Various Poppies including Opium Poppycattle, humansallcodine, morphine, protopine
Phytolacca americanaPokeweedcattle, sheep, humans, turkeys, swine, horsesallphytolaccatoxin, phytolaccigenin
Pinus ponderosaPonderosa Pinecattleneedles, young shootsunknown
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
Quercus spp.Oak Treeshorse, cattleacorns, young leavesgallotannins, quercitrin, and quercitin
Ranunculus spp.Buttercup, Crowfootcattle, goats, horsesallprotoanemonin
Robinia pseudoacaciaBlack Locusthorses, cattle, humans, poultry, sheep, goatsbark, leaves, seedsrobin, phasin
Rumex spp.Dockcattle, sheepleavessoluble oxalates
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
Sorghum spp.Sorghum, Milo, Sudan Grass, Johnson Grasshorses, cattle, goatsleaves, stemsdhurrin, nitrate
Tetradymia spp.Horsebrushsheep, cattleleaves
Trifolium spp.Alsike Clover, Red Clover, White Cloverhorse, cattleall, leavesnitrate
Triglochin maritimaArrowgrasscattle, sheepall, leaves, flowerstaxiphillin, triglochinin
Xanthium strumariumCockleburcattle, humans, rodents, swineseedlings, seedscarboxyatractyloside