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Poisonous plants are those plants that produce toxins that deter herbivores from consuming them. Plants cannot move to escape their predators, so they must have other means of protecting themselves from herbivorous animals. Some plants have physical defenses such as thorns, spines and prickles, but by far the most common type of protection is chemical. Over millennia, through the process of natural selection, plants have evolved the means to produce a vast and complicated array of chemical compounds in order to deter herbivores. Tannin, for example, is a defensive compound that emerged relatively early in the evolutionary history of plants, while more complex molecules such as polyacetylenes are found in younger groups of plants such as the Asterales. Many of the known plant defense compounds primarily defend against consumption by insects, though other animals, including humans, that consume such plants may also experience negative effects, ranging from mild discomfort to death.
Many of these poisonous compounds also have important medicinal benefits. The varieties of phytochemical defenses in plants are so numerous that many questions about them remain unanswered, including:
Which plants have which types of defense?
Which herbivores, specifically, are the plants defended against?
What chemical structures and mechanisms of toxicity are involved in the compounds that provide defense?
What are the potential medical uses of these compounds?
These questions and others constitute an active area of research in modern botany, with important implications for understanding plant evolution and for medical science.
Below is an extensive, if incomplete, list of plants containing poisonous parts that pose a serious risk of illness, injury, or death to humans or animals. There is significant overlap between plants considered poisonous and those with psychotropic properties, some of which are toxic enough to present serious health risks at recreational doses. It is also important to remember that there is a distinction between plants that are poisonous because they naturally produce dangerous phytochemicals, and those that may become dangerous for other reasons, including but not limited to infection by bacterial, viral, or fungal parasites, the uptake of toxic compounds through contaminated soil or groundwater, and/or the ordinary processes of decay after the plant has died; this list deals exclusively with the former. Many plants, such as peanuts, also produce compounds that are only dangerous to people who have developed an allergic reaction to them, and with a few exceptions, those plants are not included on this list (see list of allergens instead). Human fatalities caused by poisonous plants – especially resulting from accidental ingestion – are rare in the United States.

Source: Wikipedia