Known As:  Hemlock, Poison Hemlock, Water Hemlock
Latin Name: Conium maculatum, Cicuta maculata
Description:  Poison Hemlock (Conium maculatum) large, coarse unpleasant-smelling plant growing up to 10 feet high.  Has hollow stems blotched with purple or light red and small white flowers grouped into flat-topped umbels.  Leaves are dark green and divided into small, ovate toothed segments.  Water Hemlock is a related plant but has a different toxic principle.  Roots grow in clusters of tubers about 2 inches long.  Leaves rises in a cluster from the roots and are divided and redivided into leaflets with pointed and notched edges and a central vein running the length of each leaflet, with secondary veins ending near the notches of the leaf.
Poisonous Parts:  All parts. Poisons in Conium maculatum are the coniine and gamma-conicine alkaloids that affect the nervous system.  Poisons in Cicuta maculatum is a complex unsaturated alcohol that initiates convulsions.  Moderate to high toxicity.
Symptoms: Produces varied toxic effects including dizziness, all loss of muscular control, disordered vision (within 15-45 minutes). May be fatal.
Treatment: Unless your cat is unconscious or having convulsions, induce vomiting and follow procedures to delay absorption and speed elimination.  Get prompt veterinary assistance.