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| Scientific Name | Common Name(s) | Species Most Often Affected | Parts Poisonous | Primary Poison(s) |
|---|---|---|---|---|
| Apocynum spp. | Dogbane | horses, cattle, humans, sheep, cats, dogs, goats | rhizome | apocynamarin |
| Asclepias spp. | Milkweed | sheep, cattle, goats | leaves, fruits, stems | desglucosyrioside, syrioside |
| Astragalus and Oxytropis spp. | Locoweed | horse,sheep, cattle | flowers, leaves, stems | selenium, nitro compounds, swainsonine |
| Brassica spp, | Rape, Cabbage, Turnips, Broccoli, Mustard | cattle, humans, swine, sheep, goats, poultry | roots, seeds | glucosinolates, brassica, anemia factor |
| Chenopodium album | Lambs Quarters | cattle, horses, humans, sheep, swine | all | nitrates |
| Eupatorium rugosum | White Snakeroot | cattle, dogs, goats, horses, humans, rabbits, sheep | all | tremetone |
| Euphorbia spp. | Poinsettia, Spurges, Snow on the Mountain | cattle, horses, humans, sheep | leaves, stems and sap | phorbol esters |
| Halogeton glomeratus | Halogeton | sheep, cattle | leaves, stems | soluble oxalates |
| Hypericum perforatum | St. Johns Wort, Klamath Weed | horses, sheep, goats | all | hypericum |
| Lantana camara | Lantana, Red Sage, Yellow Sage, West Indian Lantana | cattle, dogs, goats, cats, humans, sheep | unripe, green berries | triterpenes |
| Lathyrus spp. | Sweet Pea, Tangier Pea, Everlasting Pea, Caley Pea, Singletary Pea | horses, rodents, turkeys, sheep, humans | seeds | DABA, ODAP, amine, phenol, glycoside |
| Leucothoe axillaris and Leucothoe davisiae | Drooping Leucothoe, Sierra Laurel | goats, sheep | leaves, nectar | andromedotoxin |
| Linum usitatissimum | Flax | cattle, sheep | all | cyanogenic glycoside |
| Lotus corniculatus | Birdsfoot Trefoil | cattle, sheep | CN tannini | |
| Medicago sativa | Alfalfa, Lucerne | cattle, chickens, humans, sheep | all | canavanine, saponins |
| Metilotus alba and Melilotus officinalis | White Sweetclover, Yellow Sweetclover | horses, cattle, sheep | stem | dicoumarol |
| Nerium oleander | Oleander | horses, cattle, sheep, dogs, humans, goats | all, leaves, stems | nerioside, oleandroside, saponins, cardiac glycosides |
| Phytolacca americana | Pokeweed | cattle, sheep, humans, turkeys, swine, horses | all | phytolaccatoxin, phytolaccigenin |
| Prunus spp. | Wild Cherries, Black Cherry, Bitter Cherry, Choke Cherry, Pin Cherry | horses, cattle, moose, sheep, swine, goats | seeds, leaves | amygdalin, prunasin |
| Pteridium aquilinium | Bracken Fern | horse, cattle, sheep, humans, swine | all | prunasin, ptaquiloside, thiaminase |
| Robinia pseudoacacia | Black Locust | horses, cattle, humans, poultry, sheep, goats | bark, leaves, seeds | robin, phasin |
| Rumex spp. | Dock | cattle, sheep | leaves | soluble oxalates |
| Senecio spp. | Senecio, Groundsels, Ragwort | horse, cattle, goats, sheep, human | leaves | jacobine, seneciphylline |
| Solanum spp. | Common Nightshade, Black Nightshade, Horse Nettle, Buffalo Bur, Potato | cattle, humans, rodents, sheep, horses, goats | leaves, immature fruit | soladulcidine,solanine |
| Tetradymia spp. | Horsebrush | sheep, cattle | leaves | |
| Triglochin maritima | Arrowgrass | cattle, sheep | all, leaves, flowers | taxiphillin, triglochinin |
| Veratrum californicum | Corn Lily, False Hellbore | sheep | all | cylcopamine |
