Aethusa cynapium

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,[1] though less so than hemlock. It has been introduced into many other parts of the world and is a common weed in cultivated ground.

Aethusa cynapium
Illustration Aethusa cynapium0.jpg
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Apiales
Family: Apiaceae
Subfamily: Apioideae
Tribe: Selineae
Genus: Aethusa
A. cynapium
Binomial name
Aethusa cynapium


Inflorescence of fool's parsley

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. Some toxins are destroyed by drying, and indeed, hay containing the plant is not poisonous.


  1. ^ Clapham, Tutin, & Warburg: Flora of the British Isles, 2nd edition, page 524

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