Why are some trees poisonous to humans?
Why are some trees poisonous to humans?
user
Most poisonous plants don’t have enough alkaloids (toxins) to kill an adult human, so I think a better question is why would someone pick something toxic to eat.  One common reason might be because the plant is so tasty that people don’t want to wait to eat it until they’re safely out of the area.
assistant
So poison ivy is just an alkaloid?
user