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Latin BinomialCommon NameFamilyCommon look-alikesToxic ConstituentsParts ToxicToxicity EffectsTopical ToxicitySafe Practical Uses
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Aconitum napellusMonkshoodRanunculaceaeGeraniumAconitine All parts (roots most toxic)Diarrhea, convulsions, ventricular arrhythmia and death; depolarizes sodium channelsMild toxicity: paraesthesia, including tingling and feelings of coldness in the extremities, headache, nausea, and heart palpitations-
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Actaea pachypodaBaneberryRanunculaceaeBlack Cohosh
Unknown (possibly glycosides)
All parts (berry and roots most toxic)Severe pain and burning of mouth and throat; salivation; severe stomach cramps, headache, diarrhea; dizziness and hallucinations. Toxic if eaten in large quantities. Roots and berries can be lethal.Does not cause contact dermatitis-
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Ageratina altissimaWhite SnakerootAsteraceaeBoneset
Trematone and glycosides
All parts (roots most toxic)Qeakness, nausea, abdominal pain, vomiting, delirium, cardiac damage, prostration and eventually, coma, deathNone known-
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Apocynum cannibidiumDogbaneApocynaceaeMilkweedCardiac glycosidesAll partsCardiac arrest, nausea, vomiting, weakness, diarrhea The milky sap from stems can cause blisters on skin, contact dermatitisCordage
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Arisaema triphyllum Jack-in-the-PulpitAraceaeTriliumsCalcium oxalateAll partsCauses severe pain of the mouth if ingested; burning and swelling of lips, tongue, and throat, excessive drooling, and vomiting May cause burning or tingling of the skin if handled. Does not cause contact dermatitis-
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Ascelpias syriacaMilkweedApocynaceaeDogbaneCardiac glycosidesAll parts (flower least toxic)Vomiting, stupor, weakness, spasmsNone known
Shoots & Flowers edible with proper preparation, sap may be used topically for warts
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Atropa belladonaDeadly NightshadeSolanaceaeOther nightshadesTropine alkaloidsAll partsLethal in very small doses. Fever, rapid pulse, dilation of pupils, hot and dry flushed skin, headache, dry mouth, difficulty of swallowing, burning of the throat, hallucinations, convulsion, deathNone known-
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Celastrus orbiculatus, C. scandens
Oriental Bittersweet, American Bittersweet
Celastraceae
Vining honeysuckles, often grows in multiflora rose (can be mistaken for rose hips if not paying attention)
Possibly evonosid or euonymin
All partsVomiting, diarrhea, weakness, convulsionsNone known-
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Cicuta maculataWater HemlockApiaceae
Apiaceae family espc. Angelica, Sambucus
CicutoxinAll partsLethal in very small doses. Muscle spasms, dilated pupils, dizziness, diarrhea, stomach pain, convulsions/seizures, tremors, fever, bloat, respiratory depression, deathCan cause blistering of the skin, numbness, etc. when handled-
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Conium maculatum Poison HemlockApiaceaeApiaceae family
Piperidine alkaloids (Coniine)
All partsLethal in very small doses. Salivation, vomiting, diarrhea, muscular weakness, paralysis, nervousness, trembling, dilation of pupils, weak pulse, convulsions, coma.Can cause blistering of the skin, numbness, etc. when handled-
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Convallaria majalisLily of the ValleyAsparagaceaeRamps
Cardiac glycosides & saponins
All partsIrregular/slow pulse, abdominal pain and diarrhea, low blood pressure, disorientation, coma, seizures. Toxic only if eaten in large quantities.None known-
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Datura stramoniumJimsonweedSolanaceaeOther nightshadesTropane alkaloidsAll parts (seeds most toxic)Hot, dry, and flushed skin, pupil dilation, headache, delirium, hallucinations, amnesia, respiratory depression, arrhythmias, rapid and weak pulse, convulsions, coma, death
Unknown, toxins may be absorbed transdermally enough to produce altered state-
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Digitalis spp.FoxglovePlantaginaceae
Scullcap (specifically D. lanata)
Cardiac glycosides (Digitoxin)
All partsNausea, vomiting, diarrhea, stomach pain, severe headache, irregular and slow pulse, tremors, unusual color visions, convulsions, cardiac arrhythmia, deathTransdermal absorption seems unlikely -does not cause contact dermatitis-
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Euphorbia lathyrisGopher SpurgeEuphorbiaceaeNone known
Diterpene esters in latex
All partsNausea, vomiting, diarrhea when ingestedRedness, swelling, blisters after some delay following contact with skin-
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Euphorbia marginata Snow on the MountainEuphorbiaceaeNone known
Diterpene esters in latex
All partsNausea, vomiting, diarrhea when ingestedRedness, swelling, blisters after some delay following contact with skin-
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Heracleum mantegazzianumGiant HogweedApiaceaeApiaceae familtFuranocoumarinsAll partsNo known cases of ingestion (I don't think you'd get that far along in the process)Reaction may occur from even brushing up against it.Severe contact dematitis, blistering, and photosensitization. Severe cases may result in amputation, scarring, blindness, or death
Edible when thoroughly cooked
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Ilex spp.HollyAquifoliaceaeOregon GrapeSaponinsBerriesVomiting, diarrhea, bdominal cramping, and occasionally dermatitis. There can be allergic sensitization and worsening dermatitis with repeat exposures. Rarely, mydriasis, hyperthermia, and drowsinessNone known-
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Kalmia latifoliaMountain LaurelEricaceaeBlueberry
Grayanotoxin, arbutin, and andromedotoxin
All parts
Interferes with normal skeletal muscle, cardiac muscle, and nerve function. Clinical effects typically occur within a few hours after ingestion, and can include acute digestive upset, excessive drooling, loss of appetite, frequent bowel movements/diarrhea, colic, sweating, abdominal pain, depression, weakness, loss of coordination, stupor, watering of eyes and nose, nausea, cardiac failure, vomiting, leg paralysis, weak heart rate, death
None known-
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Narcissus pseudonarcissusDaffodilAmaryllidaceaeDaylillies
Phenanthridine alkaloids (lycorine) and calcium oxalates
All parts (bulbs most toxic)Nausea, vomiting, diarrhea, salivation, trembling, convulsions, low blood pressure, cardiac arrhythmia Contact dermatitis ("lily rash") following the handling of bulbs, flowers, and stems-
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Ornithogalum umbellatumStar of BethlehemAsparagaceae
Wild Garlic, Spring Beauties
Cardiac glycosides (convallatoxin and convalloside)
Aerial partsNausea, salivation, vomiting, diarrhea, and shortness of breath, as well as pain, burning, and swelling of lips, tongue, and throat, deathMay cause skin irrtation with prolonged handling
Bulbs are edible raw (verified: I didn't die. They taste like crap)
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Phytolacca americana PokePhytolaccaceaeElderberrySaponinsAll parts except berry flesh (seeds are toxic)Nausea, pink foamy diarrhea, respiratory distress, muscle spasms, thirst, lethargy, excessive salivation, urinary incontentince, severe gastroinstinal pain; note: only recorded cases of lethality involved consumption of massive quantities - otherwise all toxicity cases make a full recovery <1 weekMay cause contact dermatitis
Roots & berries medicinal (low dose), young shoots & leaves edible with proper preparation, most toxic parts: seeds, roots, mature leaf/stem
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Petasites spp.Sweet ColtsfootAsteraceaeTussilagoPyrrolizine alkaloidsAll partsHepatotoxic when used in high doses or for long periods of timeNone knownLow dose medicinal
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Ranunculus spp. ButtercupRanunculaceaeSochan
Protoanemonin, released from the glycoside ranunculin.
All partsBurning of the mouth, abdominal pain, vomiting, hypersalivation, depression, anorexia, wobbly gait, and bloody diarrheaSkin redness, burning sensation, and blisters following contact with sap
Some species are supposedly edible when cooked (not verified)
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Rhododendron spp.Rhododendron, AzaleaEricaceaeTeaberry, Blueberry
Grayanotoxin and andromedotoxin
All partsSalivation, watering of eyes and nose, abdominal pain, loss of energy, depression, nausea and vomiting, diarrhea, weakness, difficult breathing, progressive paralysis of arms and legs, cardiac failure, coma, deathNone known-
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Sambucus racemosa Red ElderAdoxaceaeBlack & Blue Elder
Cyanogenic glycosides
All parts (flower least toxic; leaves, bark, fruits most toxic)
Mild toxicity; nausea, vomiting, stupor, weaknessNone known
Medicinal when properly prepared
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Securigera variaCrown VetchFabaceaeAlfalfaNitroglycosidesAll partsVomiting, diarrhea, slowed pulseNone known-
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Senecio spp.Ragwort, GroundselAsteraceae
Sow Thistle, Dandelin, Wild Lettuce
Pyrrolizine alkalioidsAll partsHepatotoxic when used in high doses or for long periods of timeNone known-
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Solanum carolinenseHorse Nettle Solanaceae
Other nightshades; Ground Cherry
SolanineAll partsNausea, vomiting, salivation, drowsiness, abdominal pain, diarrhea, weakness, respiratory depression, deathNone known-
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Solanum dulcamaraWoody NightshadeSolanaceaeOther nightshades
Solanine, dulcamarine (atropine/anticholanergic-like)
All partsSalivation, bradycardia, tachycardia, hypotension, and altered mental status have also been documented. Symptoms usually occur several hours after ingestion and may persist for several days. The solanine effects seem more potent in childrenNone known-
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Solanum nigrumBlack NightshadeSolanaceaeOther nightshadesSolanineLeaf, stemHypersalivation, inappetence, severe gastrointestinal upset, diarrhea, vomiting, drowsiness, CNS depression, abdominal pain, confusion, nausea, behavioral change, weakness, dilated pupils, slow heart rate, deathNone known
Ripe berries are edible - large quantities OK. Leaves edible when properly prepared.
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Symplocarpus foetidusEastern Skunk CabbaggeAraceaeFalse Hellebore, RampsCalcium oxalateAll partsSevere pain and burning of mouth, lips, and throat, drooling, nausea, excessive drooling, vomiting, difficulty swallowing, and diarrhea May cause burning and tingling of the skin if handled for long periods
Dried root medicinal, young leaves edible when properly prepared
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Taxus canadensis Canada YewTaxaceae
Pinaceae & Cupressacea; Fir, Spruce, etc.
TaxineAll parts except arilNervousness, trembling, slow pulse, pupil dilation, seizures, difficult breathing, abdominal pain, vomiting, diarrhea, weakness, convulsions, deathNone known
Arils edible, seed inside (and all other parts) toxic
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Toxicodendron radicansPoison IvyAnacardiaceae
English Ivy, Virginia Creeper
UrushiolAll partsTopically: Contact dermitits, red, itchy, painful, blistering skin.... Ingestion: Gastroinestinal and respiratory distress; inhaling poiso ivy smoke can potentially be fatal because it causes lung inflammation and fluid build-up in the lungsSever itching and blistering of the skin, delayed reaction upon contact with the plant material or smoke. Symptoms can be avoided by washing affected area immediately with soap and water.-
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Toxicodendron vernix Poison SumacAnacardiaceae
Other sumacs; Staghorn Sumac
UrushiolAll partsIngestion: fever, coughing, wheezing, gastrointestinal distress. Inhaling poison sumac smoke can potentially be fatal because it causes lung inflammation and fluid build-up in the lungs. Sever itching and blistering of the skin, delayed reaction upon contact with the plant material or smoke. Symptoms can be avoided by washing affected area immediately with soap and water.-
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Vinca spp. / Catharanthus rosea form. Vinca rosea
PeriwinkleApocynaceaeVioletsVinblastineAll partsLow blood pressure, tremors collapseNone known-
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Veratrum virideFalse HelleboreMelanthiaceaeSkunk Cabbage, RampsSteroidal alkaloidsAll partsBurning of mouth and throat, salivation, headache, stomach pain, vomiting, diarrhea, weakness, sweating, convulsionsToxins may be absorbed transdermally-
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