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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)
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
Chenopodium albumLambs Quarterscattle, horses, humans, sheep, swineallnitrates
Eupatorium rugosumWhite Snakerootcattle, dogs, goats, horses, humans, rabbits, sheepalltremetone
Euphorbia spp.Poinsettia, Spurges, Snow on the Mountaincattle, horses, humans, sheepleaves, stems and sapphorbol esters
Halogeton glomeratusHalogetonsheep, cattleleaves, stemssoluble oxalates
Hypericum perforatumSt. Johns Wort, Klamath Weedhorses, sheep, goatsallhypericum
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
Leucothoe axillaris and Leucothoe davisiaeDrooping Leucothoe, Sierra Laurelgoats, sheepleaves, nectarandromedotoxin
Linum usitatissimumFlaxcattle, sheepallcyanogenic glycoside
Lotus corniculatusBirdsfoot Trefoilcattle, sheepCN tannini
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
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
Pteridium aquiliniumBracken Fernhorse, cattle, sheep, humans, swineallprunasin, ptaquiloside, thiaminase
Robinia pseudoacaciaBlack Locusthorses, cattle, humans, poultry, sheep, goatsbark, leaves, seedsrobin, phasin
Rumex spp.Dockcattle, sheepleavessoluble oxalates
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
Tetradymia spp.Horsebrushsheep, cattleleaves
Triglochin maritimaArrowgrasscattle, sheepall, leaves, flowerstaxiphillin, triglochinin
Veratrum californicumCorn Lily, False Hellboresheepallcylcopamine