Plants that Poison

House Plants
Plant   Toxic Part   Symptoms
Hyacinth, Narcissus, Daffodil   Bulbs   Nausea, Vomiting, Diarrhea
Oleander   All Parts   Affects the heart, produces severe digestion upset
Dieffenbachia (Dumb Cane) & Philodendron   All Parts   Intense burning and irritation of the mouth and tongue. Base of tongue may swell enough to block the air passage of the throat.
Rosary Pea, Castor Bean   Seeds   Burning sensation in mouth and throat, nausea, vomiting,diarrhea,and excessive thirst. Can cause convulsions and uremia
Poinsettia   Leaves   Not as toxic as originally stated
Mistletoe   All Parts   Mild intestinal irritation and diarrhea

Flower Garden Plants
Larkspur   Young plant, Seeds   Digestive upset, nervous excitement, depression
Monkshood   Fleshy Roots   Digestive upset, nervous excitement
Autumn Crocus, Star of Bethlehem   Bulbs   Vomiting and nervous excitement
Lily of the Valley   Leaves, Flowers   Irregular heart beat and pulse, usually accompanied by digestive upset and mental confusion
Lily   Leaves, Flowers, Pollen   Kidney failure in cats if any part of plant is ingested
Iris   Underground Stems   Produces nausea, abdominal pain and vomiting
Foxglove   Leaves   One of the sources of the drug digitalis, used to stimulate the heart. In large amounts, the active principals cause digestive upset, mental confusion and dangerous irregular heartbeat and pulse
Bleeding Heart   Foliage, Roots   May cause convulsions and difficult breathing when eaten in large quantities
Sweet Pea   Seeds   If eaten in large quantities, can produce paralytic syndrome

Vegetable Garden Plants
Rhubarb   Leaf Blade   Large amounts of raw or cooked leaves can cause convulsions, coma
Potato   Sprouts, Foliage   Digestive Upset Green Potato Skin
Tomato   Leaves   Cardiac Depression

Ornamental Plants
Daphne   All Parts, especially the berries   Burning sensation in mouth and throat, can cause gastro-intestinal irritation, internal bleeding and bloody diarrhea
Wisteria   Seeds, Pods   Mild to severe digestive upset
Golden Chain   Bean-like capsules where seeds are suspended   Excitement, staggering, convulsions and coma
Laurels, Rhododendron, Azaleas   All Parts   Produces nausea and vomiting, depression difficult breathing, prostration and coma
Yew   Berries, Foliage   Diarrhea, trembling, muscular weakness, difficult breathing. Rapid collapse can occur if eaten in quantity
Magnolia   Flower   Headache and depression

Trees and Shrubs
Wild and Cultivated Cherry   Twigs and Foliage   Contains a compound that releases cyanide when eaten. Gasping, excitement, and prostration are common symptoms that often appear in minutes
Oaks   Foliage, Acorns   Affects the kidney gradually. Symptoms appear only after several days or weeks. Take a large amount for poisoning
Elderberry   Shoots,Leaves,Bark   Children have been poisoned by using pieces of the pithy stems for blowguns. Nausea and digestive upset
Black Locust   Bark,Sprouts,Foliage   Children have suffered nausea,weakness and depression after chewing the bark and seeds
Holly   Berries   Vomiting and diarrhea may occur depending on types of holly and its maturation

Wild Plants
Mayapple   Apple, Foliage, Roots   Contains at least 16 active toxic principals, primarily in the roots. Children often eat the apple with no ill effects but several apples may cause diarrhea
Skunk Cabbage   Leaves, Rootstalk   Burning and swelling of mouth, tongue and throat
Water Hemlock   All Parts, especially the tubers   Diarrhea, violent and painful convulsions
Buttercups   All parts   Irritant juices may severely irritate the digestive system
Nightshade   All Parts, especially the unripe berry   American nightshade may lead to intense digestive disturbances while English deadly nightshade strikes the nervous system
Poison Hemlock   All Parts   The tuber resembles a large wild carrot. Nausea vomiting and convulsions may occur
Jimson Weed (Thorn Apple)   All Parts   Abnormal thirst, distort sight, delirium, incoherence and coma




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