I thought the mention of water hemlock near the end was interesting. Actually, common poison hemlock (which is related) grows all over the U.S. midwest like a weed and it is very deadly. You will see it growing in fields and at the side of many highways if you drive through Ohio. It is commonly mistaken for wild carrots (aka queen anne's lace). It famously was used to poison Socrates, and it kills a lot of livestock accidentally in modern times.
https://www.ars.usda.gov/pacific-west-area/logan-ut/poisonou...