Symphoricarpos albus and related spp.
Snowberries are sometimes grown as ornamental shrubs in North America and Europe. One child, after eating three berries, experienced mild sedation, vomiting, and slight dizziness. Others have died from eating them. In several indigenous languages, they are known as ghost berries or corpse berries.
Zantedeschia aethiopica and related spp.
When ingested, this attractive flower causes intense burning of the mouth and throat. however, it is seldom fatal. They are grown as houseplants in many places, although they are native to South America.
Jack in the Pulpit
Grows in much of Eastern North America. The plant causes salivation, nausea, and vomiting. Very rarely, it causes irregular heart beat, fits, coma, and death. Fortunately, the plant burns when it is swallowed, so a fatal dose is rare.
Ranunculus spp. and related genera
Attractive yellow flowers. They are found throughout North America. The fresh plants can cause painful blistering of the skin and irritate the mouth. However, they taste horrible, so it is rare that they are eaten in quantity. However, a fatal dose is not impossible.