Bloodroot
This plant is called bloodroot for a good reason. Its name should be enough to deter you from getting anywhere near it. Even merely touching the plant can cause skin irritation or scabbing, due to the destruction of the tissues. If taken in large enough doses by accident, it’s incredibly toxic and even fatal to humans and pets. This is due to the alkaloids found throughout the plant, which affect the nervous system. This causes vomiting and eventually coma and death if not treated in time. Interestingly enough, many Native groups use bloodroot as a die, because of its bright red, vibrant coloring (Cornell Botanical Gardens).