[Wikipedia] Range, Habitat, Teratogenic Effects: Veratrum californicum (California corn lily, white or California false hellebore) is an extremely poisonous plant[1] native to western North America, including the Sierra Nevada and Rocky Mountains, as far north as Washington and as far south as Durango; depending on latitude, it grows from near sea level to as high as 11,000 feet.[2][3] Teratogenic effects It is a source of jervine, muldamine and cyclopamine, teratogens which can cause prolonged gestation associated with birth defects[7] such as holoprosencephaly and cyclopia in animals such as sheep,[1] horses, and other mammals that graze upon it. These substances inhibit the hedgehog signaling pathway.[8] (link added by Mary Ann Machi)