List of poisonous plants

This is a list of plants containing poisonous parts that pose a serious risk of illness, injury, or death to humans.

Potato (Solanum tuberosum) All green parts contain the glycoalkaloid solanine - considered inedible when raw; cooked potatoes have had starches softened and rendered edible
Tomato (Lycopersicon esculentum) Foliage and vines contain alkaloid poisons
Rhubarb (Rheum rhaponticum) Leaves contain oxalic acid salts
Cherry (Prunus cerasus), as well as other species such as peach, plum, almond and apricot (Prunus) Leaves and pits contain cyanogenic glycosides
Pokeweed (Phytolacca sp.) Leaves, berries and roots contain phytolaccatoxin and phytolaccigenin - toxin in young leaves is reduced when boiled twice

Privet (Ligustrum sp.) Possibly fatal to humans, berries contain ligustrin and syringin
Foxglove (Digitalis purpurea) Fatal to humans, contain cardiac or steroid glycosides
Lilies Most are poisonous, especially to cats
Yew (Taxus baccata, the "English yew") All parts of the plant, except for the fleshy red bit of the fruit, contain poisons
Deadly nightshade (Atropa belladonna) All parts of the plant contain the toxic alkaloid atropine
Oleander (Nerium oleander) All parts are toxic, containing nerioside, oleandroside, saponins, cardiac glycosides, but especially the leaves and woody stems
Castor oil plant (Ricinus communis) Oil is purgative; seed meal separate from oil is source of the deadly toxic protein, Ricin
Aconite (wolfsbane, monkshood) (Aconitum napellus) The poison is concentrated in the unripe seed pods and roots
Delphinium Contains the alkaloid Delsoline

Poinsettias (Euphorbia pulcherrima) Notable for not being poisonous, despite persistent beliefs to the contrary

Poison Ivy (Toxicodendron radicans), Poison Oak (T.diversilobum), and Poison Sumac (T.vernix) All contain a highly irritating oil known as urushiol
Deadly Nightshade/Belladonna (Atropa belladonna) All parts of the plant contain the toxic alkaloid atropine
Poison Hemlock (Conium maculatum) All parts of the plant contain the relatively simple alkaloid coniine
Mayapple (Podophyllum peltatum) Green portions of the plant, unripe fruit, and especially the rhizome contain the non-alkaloidal toxin podophyllotoxin

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