poison ivy: climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact
poisonous plant: a plant that when touched or ingested in sufficient quantity can be harmful or fatal to an organism
oak-leaved goosefoot: annual European plant with spikes of greenish flowers and leaves that are white and hairy on the underside; common as a weed in North America