Helleborus niger and related spp.
An herbaceous perennial, with the flowers blooming in winter or spring. Poisoning is rare, but can be fatal. Symptoms of poisoning involve cramps, nausea, visual disturbances, and vomiting.
Larkspur and Delphinium
Consolida ajacis, Delphinium spp.
These plants grow in many gardens. Their poison is similar to that of aconite, a highly poisonous plant. The amount of poison in these plants depends on the age of the plant and the species, but a fatal dose is not impossible.
Carrot like plants. The root can be mistaken for carrots and the leaves for parsley. The plant has an unpleasant taste and smell, which is fortunate, since it is deadly poison. It was used to kill Socrates and is said to be a very humane way to die. Initially, those who eat it will feel stimulated, then fall into severe depression of the nervous system, became paralyzed, and die if not helped.