Thapsia, commonly known as the deadly carrots,[2] is a small genus of poisonous plants in the family Apiaceae.

The seeds have four wings, and are the main characteristic of the genus, which is distributed in the Mediterranean, on the Iberian peninsula, and North Africa.

The generic name Thapsia is derived from the Ancient Greek name θαψία (thapsía) for the members of the genus.

The Greek colony of Cyrene exported a medicinal plant known as silphion, used as a purgative and emetic.

Although its exact identity remains contentious today, some historians believe that the plant may have been Thapsia garganica.