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.

synonyms: California fern, Conium maculatum, hemlock, Nebraska fern, poison hemlock, winter fern.

Polish: weszka, pietrasznik plamisty, świńska wesz, szaleń plamisty, szczwół plamisty, psia pietruszka, pietrasznik