Fool's Parsley (Aethusa cynapium) (also known as Fool Cicely) is an annual (rarely biennial) herb in the plant family Apiaceae, native to Europe, western Asia and northwest Africa.

It has a fusiform root and a smooth hollow branched stem growing to about 80 cm high, with much divided (ternately pinnate) smooth leaves with an unpleasant smell, and small compound umbels of small irregular white flowers.

It is related to Hemlock and Water-dropwort and like them is very poisonous, though the toxins are destroyed by drying, and hay containing the plant is not poisonous. Symptoms of poisoning are heat in the mouth and throat.

It has been introduced into many other parts of the world and is a common weed in cultivated ground.

Apiaceae

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