White snakeroot contains a toxic oil, tremetol, that can be passed from cows to humans as a constituent of the milk fat.
Active Plant ingredient Part Symptoms Hemp (Cannabis Tetrahydro Leaves, Hallucinations, sativa L.) cannabinol flowers confusion Jimson weed Indole Seed leaves Delirium, alkaloids convulsions, coma Nightshade Solanine Berries Delirium, alkaloids leaves convulsions, coma Water hemlock Cicutoxin, an Root, stem Convulsions, (Cicuta spp.) alcohol death White snake Tremetol, Leaves and Milk sickness, root an oil stems trembles, (Eupatorium liver failure, rugosum) death Table 14-8 Longevity of weed seeds buried in the soil.