Poison hemlock (Conium maculatum)

Poison hemlock (Conium maculatum)
Image courtesy Weed Science Society of America
Poison hemlock (Conium maculatum)
Image courtesy Bonnie Rasmussen
Poison hemlock (Conium maculatum)
Image courtesy Weed Science Society of America
EDRR Species?: 
No

Description
Biennial, blooms in early summer. Grows 3 to 7 feet tall. Stems are erect. Leaves alternate, one per node, and are petioled and pinnately divided. Flowers are white in compound stemmed umbels, mostly flat on top. The enlarged taproot is the most easily recognizable feature.

Impacts
Grows in pastures, streams and irrigation ditches. Several deaths of livestock and humans are attributed each year to this species.