poison parsley
     n : large branching biennial herb native to Eurasia and Africa
         and adventive in North America having large fernlike
         leaves and white flowers; usually found in damp habitats;
         all parts extremely poisonous [syn: {hemlock}, {poison
         hemlock}, {California fern}, {Nebraska fern}, {winter
         fern}, {Conium maculatum}]
Source: WordNet® 2.0