According to the Cleveland Clinic, “poison hemlock (Conium maculatum) is a highly toxic plant that’s a member of the carrot family. It’s commonly mistaken for wild carrot, wild parsnip or wild parsley. This can lead you to accidentally eat it (ingestion). Every part of the hemlock plant is poisonous, including the seeds, root, stem, leaves and fruit. It can be fatal if ingested. Ancient Greeks used poison hemlock to execute criminals or political prisoners. The most famous example of this is the execution of Socrates.”
The toxins of the plant are found in the sap of the poison hemlock. According to Joe Boggs, assistant professor at Ohio State University Extension, all parts of the plant are poisonous.