RIAU24.COM  - A plant called Hemlock Water Dropwort that grows wild on the island of Sardinia and is used in ancient Sardinian death rituals has been used since pre-Roman times to ritually kill parents who are a burden on society.

Old people who can no longer support themselves will be drunk and killed with this plant.

zxc1 The
venom of this plant can cause facial muscles to contract, leaving an eerie smile on the corpse's face.

This plant is closely related to parsnips and carrots, the roots have a pleasant taste, but the whole plant is very poisonous. 

Hemlock Water Dropwort is the UK's most poisonous plant and all parts are poisonous, it is reported that death can occur within hours of ingestion.