Veratrum viride is also know as Corn Lily, American White Hellebore, Indian Poke, and Itch-weed. Wikipedia tells us the plant is highly toxic, causing nausea and vomiting. If the poison is not evacuated, cold sweat and vertigo appears, respiration slows, cardiac rhythm and blood pressure falls, eventually leading to death. It is used by several native American nations for external treatment. Although it is rarely ever used in modern herbary due to its concentration of various alkaloids, it has been used in the past against high blood pressure and rapid heartbeat. The root contains even higher concentrations than the aerial parts.