1. A large biennial herb native to Eurasia and Africa, naturalized in North America, having fernlike leaves and white flowers; all parts extremely poisonous
   "The botanist warned students to avoid touching the poison hemlock";
   - hemlock, poison parsley, Nebraska fern, winter fern, Conium maculatum

Derived forms: poison hemlocks

Type of: poisonous plant

Part of: Conium, genus Conium

Encyclopedia: Poison hemlock