Other names: Deadly hemlock, poison parsley
Life cycle: Biennial
Found in: Pastures and roadsides throughout the U.S., but less common in the northern Great Plains.
General description: Erect plant that grows up to 10 feet high.
Seedlings: Cotyledons are narrow and lanceolate on long petioles.
True leaves: Large, alternate and triangular. Grow 8" to 16" long and are a dark glossy green. Form a basal rosette the first year but occur on erect stems the second year.
Flowers and fruit: Flowers are large, white and composed of a cluster of smaller flowers that arise from a common point. Fruit is a dry schizocarp that splits in two.
Special note: Poison hemlock is poisonous to livestock when consumed but is rarely eaten.