FLORA ID

Poisonous Food Plants

Potato (Solanum tuberosum) Can contain the glycoalkaloid solanine; this develops as the eyes prepare to sprout chiefly as a result of exposure to light. Green tinged flesh is a sign that this process has begun.
Apple (Malus domestica) Seeds contain cyanogenic acids in them; although the amount found in most apples won't kill a person, with enough seeds, one could die from it.
Tomato (Solanum lycopersicum) 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 with each boiling and draining.

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 taxane alkaloids
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
Angel's Trumpet (Brugmansia); All parts of the plant contains the tropane alkaloids scopolamine and atropine.
Datura; Contains the alkaloids scopolamine and atropine. Datura has been used as a hallucinagenic drug by the native peoples of the Americas.
Poinsettias (Euphorbia pulcherrima) Notable for not being poisonous, despite persistent beliefs to the contrary, although may cause an upset stomach.

Poison Ivy (Toxicodendron radicans), Poison Oak (T.diversilobum), and Poison Sumac (T.vernix) All contain a highly irritating oil known as urushiol(this is actually not a poison but an allergen)
Deadly Nightshade/Belladonna (Atropa belladonna) All parts of the plant contain the toxic alkaloid atropine
Black nightshade (Solanum nigrum) All parts of the plant except the ripe fruit contain the toxic glycoalkaloid solanine
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
Darnel/Poison Ryegrass (Lolium temulentum) The seeds and seed heads of this common garden weed may contain the alkaloids temuline and loliine. Some experts also point to fungus ergot or fungi of the genus endoconidium that grow on the seed heads of rye grasses.^[2]

If you have a poisoning emergency, call 1-800-222-1222.