Aethusa cynapium (fool's parsley, fool's cicely, or poison parsley) is an annual (rarely biennial) herb in the plant family Apiaceae, native to Europe, western Asia, and northwest Africa. It is the only member of the genus Aethusa. It is related to Hemlock and Water-dropwort, and like them it is poisonous, though less so than hemlock. It has been introduced into many other parts of the world and is a common weed in cultivated ground.
It has a fusiform root and a smooth hollow branched stem growing to about 80 cm (31 in) high, with much divided (ternately pinnate) smooth leaves with an unpleasant smell, and small compound umbels of small irregular white flowers.
Poisoning from fool's parsley results in symptoms of heat in the mouth and throat and a post-mortem examination has shown redness of the lining membrane of the gullet and windpipe and slight congestion of the duodenum and stomach. Since some toxins are destroyed by drying, hay containing the plant is not poisonous.