• any of these are posionous

• Aconitum
• (Aconite, wolfsbane, monkshood) (Aconitum napellus). The poison is concentrated in the unripe seed pods and roots, but all parts are poisonous. Causes digestive upset, nervous excitement. The juice in plant parts is often fatal. It is a quick-acting poison often used to coat poisonous arrows in Asia.

• Adenium obesum
• . Also known as Sabi Star, Kudu or Desert-rose.The plant exudes a highly toxic sap which is used by the Meridian High and Hadza in Tanzania, to coat arrow-tips for hunting.

• Agave
• . The juice of a number of species causes acute contact dermatitis, with blistering lasting several weeks and recurring itching for several years thereafter.

• Abrus precatorius
• , known commonly as Jequirity, Crab's Eye, Rosary Pea, 'John Crow' Bead, Precatory bean, Indian Licorice, Akar Saga, Giddee Giddee or Jumbie Bead in Trinidad & Tobago. Particularly dangerous as the brightly-coloured seeds (usually black and red) are commonly used in jewellry and easily eaten by children.

• Angel's Trumpet
• (Brugmansia). All parts of the plant contains the tropane alkaloids scopolamine and atropine. Often fatal.

• Asparagus
• . The berries are poisonous.[1]

• Autumn crocus
• . The bulbs are poisonous and cause nausea, vomiting, diarrhea. Can be fatal.

• Azalea
• . (Azalea ssp.) All parts of the plant are poisonous and cause nausea, vomiting, depression, breathing difficulties, coma. Rarely fatal.

• Bittersweet nightshade
• (Solanum dulcamara). All parts are poisonous, containing solanine and causing fatigue, paralysis, convulsions, and diarrhea. Rarely fatal.[2]

• Bleeding heart
• (Dicentra cucullaria)/Dutchman's breeches. Leaves and roots are poisonous and cause convulsions and other nervous symptoms.

• Black locust
• . Pods are toxic.

• Black nightshade
• (Solanum nigrum). All parts of the plant except the ripe fruit contain the toxin glycoalkaloid solanine.

• Blister Bush
• (Peucedanum galbanum). All parts are poisonous, and contact causes painful blistering that is intensified with exposure to sunlight.

• Blue-green algae
• (Anacystis cynea and Anabaena circinalis)

• Calabar Bean
• (Physostigma venenosum) Also known as ordeal beans due to their former use in trials by ordeal. Contains the alkaloid physostigmine.

• Caladium
• / Elephant Ear. All parts of the plant are poisonous. Symptoms are generally irritation, pain, and swelling of tissues. If the mouth or tongue swell, breathing may be fatally blocked.

• Castor oil plant
• (Ricinus communis). The phytotoxin is ricin, an extremely toxic water-soluble protein, which is concentrated in the seed. Also present are ricinine, an alkaloid, and an irritant oil. Causes burning in mouth and throat, convulsions, and is often fatal.

• Cerbera odollam
• . Colloquially known as the Suicide Tree, the nut contains cerberin, which stops the heart.

• Cocklebur
• (Xanthium spp.). Seedlings and seeds are poisonous to livestock.

• Daffodil
• (Narcissus (genus)). The bulbs are poisonous and cause nausea, vomiting, and diarrhea. Can be fatal. Stems also cause headaches, vomiting, and blurred vision.

• Daphne
• (Daphne sp.). The berries (either red or yellow) are poisonous, causing burns to mouth and digestive tract, followed by coma. Often fatal.

• 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 the fungusergotor fungi of the genus endoconidium, both of which grow on the seed heads of rye grasses, as an additional source of toxicity.[3]

• Datura
• / nightshade. Contains the alkaloids scopolamine and atropine. Datura has been used as a hallucinogenic drug by the native peoples of the Americas and others.[4]Incorrect dosage can lead to death.

• Deadly nightshade
• (Atropa belladonna). All parts of the plant contain the toxic alkaloid atropine. The young plants and seeds are especially poisonous, causing nausea, muscle twitches, paralysis; often fatal.

• Deathcamas
• / black snakeroot. All parts of the plant are poisonous, causing nausea, severe upset.

• Delphinium
• . Contains the alkaloid delsoline. Young plants and seeds are poisonous, causing nausea, muscle twitches, paralysis, often fatal.

• Doll's eyes
• . Berries are highly poisonous, as well as all other parts.

• Dumbcane
• / dieffenbachia. All parts are poisonous, causing intense burning, irritation, and immobility of the tongue, mouth, and throat. Swelling can be severe enough to block breathing, leading to death.

• Elderberry
• . The roots are considered poisonous and cause nausea and digestive upset.

• European Holly
• (Ilex aquifolium). The berries cause gastroenteritis.

• Excoecaria
• (milky mangrove, blind-your-eye mangrove, river poison tree).

• Foxglove
• (Digitalis purpurea). The leaves, seeds, and flowers are poisonous, containing cardiac or other steroid glycosides. These cause irregular heartbeat, general digestive upset, and confusion. Can be fatal.

• Frangipani
• (Plumeria spp.). Contact with the sap may irritate eyes and skin.

• Giant hogweed
• is a phototoxic plant. Its sap can cause phytophotodermatitis (severe skin inflammations) when the skin is exposed to sunlight or to UV-rays. Initially the skin colours red and starts itching. Then blisters form as in burns within 48 hours. They form black or purplish scars, which can last several years. Hospitalisation may become necessary. Presence of minute amounts of sap in the eyes can lead to temporary or even permanent blindness.

• Gifblaar
• (Dichapetalum cymosum). Well-known as a livestock poison in South Africa; this plant contains the metabolic poison fluoroacetic acid.

• Hemlock
• (Conium maculatum). All parts of the plant contain the relatively simple alkaloid coniine which causes stomach pains, vomiting, and progressive paralysis of the central nervous system. Can be fatal; it is the poison that killed Socrates. Not to be confused with hemlock trees (Tsugaspp), which are not edible but are not nearly as toxic as the herbaceous plant Conium.

• Hemlock water-dropwort
• (Oenanthe crocata). Carrot-like roots poisonous to livestock.

• Henbane
• . Seeds and foliage poisonous.

• Horse-chestnut
• . All parts of the plant are poisonous, causing nausea, muscle twitches, and sometimes paralysis.

• Holly
• . Berries cause vomiting, nausea, and diarrhea.

• Hyacinth
• . The bulbs are poisonous, causing nausea, vomiting, gasping, convulsions, and possibly death.

• Ivy
• . (Hedera helix)The leaves and berries are poisonous, causing stomach pains, labored breathing, possible coma.

• Jequirity
• . The seed is extremely poisonous.

• Jerusalem cherry
• . (Solanum ssp.). All parts, especially the berries, are poisonous, causing nausea and vomiting. It is occasionally fatal, especially to children.

• Jimson weed
• / datura / thorn apple / stinkweed / Jamestown weed (Datura stramonium). All parts of the plant are poisonous, causing abnormal thirst, vision distortions, delirium, incoherence, coma. Often fatal. A significant grazing livestock poison in North America.

• Laburnum
• . All parts, especially the seeds, are poisonous, causing excitement, staggering, convulsions, coma; occasionally fatal.

• Larkspur
• (both Delphinium and Consolida spp).[5]Young plants and seeds are poisonous, causing nausea, muscle twitches, paralysis. Often fatal.

• Lilies
• . Most are poisonous, especially to cats.

• Manchineel
• (Hippomane mancinella). All parts of this tree, including the fruit, contain toxic phorbol esters typical of the Euphorbiaceae.

• Mayapple
• (Podophyllum peltatum). Green portions of the plant, unripe fruit, and especially the rhizome contain the non-alkaloid toxin podophyllotoxin, which causes diarrhea, severe digestive upset.

• Monkshood
• . All parts of the plant are highly poisonous. Ancient warriors used it to poison their enemies' water supplies. Used in the past for killing wolves. Causes burning, tingling, and numbness in the mouth, then the intestine, followed by vomiting; death by asphyxiation.

• Moonseed
• . The fruits and seeds are poisonous, causing nausea and vomiting. Often fatal.

• Mother of Millions
• (Kalanchoe tubiflora). These plants are deadly to livestock, and there is every indication that they are toxic to humans.

• Mountain Laurel
• (Kalmia latifolia). All parts of the plants are poisonous.

• Oak
• . (Quercus ssp). Most species' foliage and acorns are mildly poisonous, causing digestive upset, heart trouble, contact dermatitis. Rarely fatal. Consumed, after proper processing, as a staple in many parts of the world.

• Oleander
• (Nerium oleander). All parts are toxic, containing nerioside, oleandroside, saponins, and cardiac glycosides, but especially the leaves and woody stems. They cause severe digestive upset, heart trouble, contact dermatitis. Very toxic. The smoke of burning oleander can cause reactions in the lungs, and can be fatal.

• Ongaonga
• (Urtica ferox). Even the lightest touch can result in a painful sting that lasts several days.

• Passiflora caerulea
• (P.caerulea) sap and rotten leaves cause death or heart-attacks.

• Passiflora foetida
• (P.foetida) bract have the poison to kill insects, while unripe fruit are poisonous and contains sodium that can kill people.

• Poison ivy
• (Toxicodendron radicans), Poison-oak (T. diversilobum), and Poison sumac (T. vernix). All parts of these plants contain a highly irritating oil with urushiol (actually not a poison, but an allergen). Skin reactions can include blisters and rashes. It spreads readily to clothes and back again, and has a very long life. Infections can follow scratching. As stated, this is an allergen, and the toxin will not affect certain people. The smoke of burning poison ivy can cause reactions in the lungs, and can be fatal.

• 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.). Berries and leaves are poisonous. Berries contain ligustrin and syringin, which cause digestive disturbances, nervous symptoms. Can be fatal.

• Redoul
• . (Coriaria myrtifolia). A mediterranean plant. The fruits are poisonous, often fatal in children.

• Rhus
• lancia | African sumac (Rhus lancia). Closely related to poison ivy, all parts of this tree contain low levels of a highly irritating oil with urushiol (actually not a poison, but an allergen). Skin reactions can include blisters and rashes. It spreads readily to clothes and back again, and has a very long life. Infections can follow scratching. As stated, this is an allergen, and the toxin will not affect certain people. The smoke of burning rhus lancia can cause reactions in the lungs, and can be fatal.

• Stinging Tree
• (Dendrocnide excelsa, Stinging tree) and similar species. The plant is capable of inflicting a painful sting when touched. The stinging may last for several days and is exacerbated by touching, rubbing, and cold. Can be fatal.

• Strychnine Tree
• (Strychnos nux-vomica). The seeds of the strychnine tree usually contain about 1.5% strychnine, an extremely bitter and deadly alkaloid. This substance throws a human into intense muscle convulsions and usually kills within three hours. The bark of the tree may also contain brucine, another dangerous chemical.

• Water hemlock
• (Cicuta sp.). The root, when freshly pulled out of the ground, is extremely poisonous and contains the toxin Cicutoxin. When dried, poison is reduced to roughly 3 to 5 percent of that when fresh.

• White Snakeroot
• (Ageratina altissima) All parts are poisonous, causing nausea and vomiting. Often fatal. Milk from cattle that have eaten white snakeroot can sicken, or kill, humans (milk sickness).

• Yellow Jessamine
• . All parts are poisonous, causing nausea and vomiting. Often fatal. It is possible to become ill from ingesting honey made from jessamine nectar.

• Yew
• (Taxus baccata). Nearly all parts of the Yew contain toxic taxanes, except the red fleshy aril surrounding the toxic seeds.[6][7]Yew seeds are especially toxic if chewed.[8]Several people have committed suicide by ingesting leaves and seeds.[9][10]

• Zantedeschia
• (Lily of the Nile or Calla lily) Zantedeschia is highly toxic and may be fatal if eaten.

get more from

http://en.wikipedia.org/wiki/List_of_poisonous_plants