The toxicity level of these plants will vary depending on plant vegetative stage, consumption, and animals’ age and physiological status.
| Scientific Name | Common Name(s) | Poisonous parts |
| Agrostemma githago | Corncockle | seed and leaves |
| Amaranthus spp. | Pigweed | leaves |
| Amsinckia intermedia | Fiddleneck | seeds |
| Brassica spp, | Rape, Cabbage, Turnips, Mustard, Broccoli, | roots, seeds |
| Chenopodium album | Lambs Quarters | all |
| Conium maculatum | Hemlock | all |
| Convallaria majalis | Lilly of the valley | Leaves, flowers and rhizome |
| Crotalaria spectabilis | showy crotalaria | all |
| Datura stramonium | Jimsonweed | all, seeds |
| Eupatorium rugosum | White snakeroot | All parts, green or dried |
| Gelsemiun sempervirens | Carolina jessamine | Flower, leaves and roots |
| Helleborus spp. | Lenten rose | |
| Hyoscyamus niger | Black Henbane | All, fresh or dry |
| Iris spp. | Irises | rhizomes and rootstocks |
| Kalmia latifolia K. angustifolia | mountain laurel sheep laurel | leaves |
| Laburnum anagyroides | Golden Chain, Laburnum | pods, seeds, all |
| Lachnanthes caroliniana | Red-root | Roots, leaves, stems, and flowers |
| Lobelia spp. | Lobelia | Leaves, stems, and fruit |
| Nerium oleander | Oleander | Leaves, green or dried; twigs |
| Nicotiana spp. | Tobacco, Tree Tobacco | leaves |
| Ornithogallum umbellatum | Bulbs | Star of Bethlehem |
| Phytolacca americana | Pokeweed | all, root |
| Podophyllum peltatum | Mayapple, Mandrake | all |
| Prunus spp. | Wild Cherries, Black Cherry, | seeds, wilted leaves, bark, twigs |
| Pteridium aquilinium | Bracken Fern | all |
| Ranunculus abortivus | Buttercup | all |
| Rheum rhaponticum | Rhubarb | leaves |
| Rhododendron maxima R catawbiense | Great laurel Rosebay Rhododendron | leaves |
| Ricinus communis | Castor bean | all, seeds |
| Sambucus spp. | Elderberry | Leaves, opening buds, and young shoots, bark, and roots |
| Senna occidentalis | Coffee weed | Leaves, stems, and raw seeds |
| Senecio jacobaea L.; Jacobaea vulgaris | Ragwort | Flowers, leaves, roots and stems, fresh or dried |
| Sorghum halepense | Johnson grass | Leaves and stems, green or wilted. |
| Xanthium strumarium | Cocklebur | seedlings, seeds |
Adapted from: Plants Poisonous to Livestock, Cornell University; Poisonous plants in pastures. University of New Hampshire; Plants poisonous to livestock and pets in North Carolina, Hardin, Brownie and Krings, 2018; Ferrari 2001, Parisini et al. 2003