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Index of plants with the same common name
Poison oak refers to two plant species in the genus Toxicodendron, both of which can cause skin irritation: Toxicodendron diversilobum or Pacific poison
Poison_oak
Medical condition
most notably sumac family species of the genus Toxicodendron: poison ivy, poison oak, poison sumac, and the Chinese lacquer tree. The name is derived from
Urushiol-induced contact dermatitis
Urushiol-induced_contact_dermatitis
Allergenic plant of Asia and North America
dermatitis. PMPH-USA. pp. 408–. ISBN 978-1-55009-378-0. "Poison Ivy, Poison Oak and Poison Sumac FAQs". Site with extensive photo images of plants and
Poison_ivy
Eastern poison oak
pubescens (syn. Rhus pubescens), commonly known as Atlantic poison oak or eastern poison oak, is an upright shrub which can cause contact dermatitis for
Toxicodendron_pubescens
Species of plant
diversilobum (syn. Rhus diversiloba), commonly named Pacific poison oak or western poison oak, is a woody vine or shrub in the sumac family, Anacardiaceae
Toxicodendron_diversilobum
Genus of plants
vines, including poison ivy, poison oak, and the lacquer tree. The best-known members of the genus in North America are eastern poison ivy (T. radicans)
Toxicodendron
Species of plant
dermatitis, poison sumac is more toxic than its relatives poison ivy and poison oak. The differences in toxicity in poison ivy, poison oak, and poison sumac
Toxicodendron_vernix
Species of plant
oak leaf. Western poison oak grows only in western North America, although many people refer to poison ivy as poison oak, because poison ivy grows in either
Toxicodendron_radicans
Over-the-counter skin cleanser
after topical exposure to urushiol, the active ingredient in poison oak, poison ivy, and poison sumac. Tecnu is made from deodorized mineral spirits, water
Tecnu
Oily mixture of plant compounds
Anacardiaceae, especially Toxicodendron spp. (e.g., poison oak, Chinese lacquer tree, poison ivy, poison sumac), Comocladia spp. (maidenplums), Metopium spp
Urushiol
Substance that causes death, injury or harm to organs
For example, the term poison oak was first recorded in 1743, and poison ivy appeared in usage by 1784. The expression poison gas was first used during
Poison
Chemical compound
protect against contact dermatitis caused by urushiol from poison ivy, poison oak, and poison sumac. The compound is one of a class of compounds developed
PDC-APB
2005 studio album by Bright Eyes
"First Day of My Life" 3:08 7. "Another Travelin' Song" 4:16 8. "Land Locked Blues" 5:46 9. "Poison Oak" 4:50 10. "Road to Joy" 3:54 Total length: 45:41
I'm_Wide_Awake,_It's_Morning
Series of young adult books by Brent Hartinger
romance. It's also the story of Russel's latest club, the Order of the Poison Oak, a secret society dedicated to helping its members see life's hidden beauty
Russel_Middlebrook_(series)
Immune system response to a substance that most people tolerate well
contact dermatitis, originates after contact with poison ivy, eastern poison oak, western poison oak, or poison sumac. Urushiol, which is not itself a protein
Allergy
Accumulation of excess fluid in tissue
(wheal and flare), and skin contact with certain plants such as poison ivy or western poison oak, the latter of which are termed contact dermatitis. In lymphedema
Edema
Cream or lotion for treating skin conditions
Calamine is used to treat itch, as from sunburn, insect bite, poison ivy, poison oak, and other skin irritants. The FDA recommends applying topical over-the-counter
Calamine
Antiseptic ointment
Bismol to market. It is used for treating the pain of minor burns, poison ivy, poison oak, itching, minor skin wounds and insect bites. Its active ingredients
Unguentine
Involves weakening, opening, or altering the coat of a seed to encourage germination
Michael Hogan (2008) Western poison-oak: Toxicodendron diversilobum, GlobalTwitcher, ed. Nicklas Stromberg "Western Poison-oak (Toxicodendron diversilobum
Scarification_(botany)
Species of tree
produces the irritant urushiol much like its close relatives poison sumac and poison oak. It is related to black poisonwood (Metopium brownei). This tree
Metopium_toxiferum
Underground stem in which various plants asexually reproduce via budding
gingers, bamboo, snake plant, the Venus flytrap, Chinese lantern, western poison-oak, hops, and Alstroemeria, and some grasses, such as Johnson grass, Bermuda
Rhizome
Species of flowering plant
California coast. It grows as far north as Baranof Island, Alaska. Western poison oak is a common associate in the California Coast Ranges. The species was
Gaultheria_shallon
Species of plant
made from other materials. Urushiol is also the oil found in poison ivy and poison oak, to which the tree is related, that causes a rash. Sap, containing
Toxicodendron_vernicifluum
American laundry soap
remedy in the treatment of contact dermatitis caused by exposure to poison ivy, poison oak, and other oil-based organic skin-irritants where they have touched
Fels-Naptha
Most populous city in California, US
was the settlement of Yaanga (Tongva: Iyáangẚ), meaning "place of the poison oak", which would eventually become the site where the Spanish founded the
Los_Angeles
Sap or other resinous plant material
seeds. An example of such a gummy coating occurs in the case of Western poison oak, a widespread shrub in western North America. Cambium Gummosis Latex Natural
Gum_(botany)
Grove of Coast Redwoods in northern California
redwood tree showing the unusual regeneration method used by redwoods. Poison oak is a native ground-cover in the Santa Cruz Mountains. The plants are most
Redwood Grove (Henry Cowell Redwoods State Park)
Redwood_Grove_(Henry_Cowell_Redwoods_State_Park)
Species of insect
Thuja (arborvitae) Tilia (basswood, linden, UK: lime) Toxicodendron (poison oak, poison ivy, sumac) Ulmus (elm) Vaccinium (blueberry) Viburnum Vitis (grape)
Japanese_beetle
Genus of trees
Smodingium argutum, the African poison ivy or pain bush, is a southern African shrub or medium-sized tree in the Anacardiaceae, which has properties comparable
Smodingium
Species of shrub
of the related poison ivy (Toxicodendron radicans) and poison oak (Toxicodendron pubescens). However, both poison ivy and poison oak have central leaflet
Rhus_aromatica
Small pocket of fluid within the upper layers of the skin
chemical such as nickel sulfate, Balsam of Peru, or urushiol (poison ivy, poison oak, poison sumac). This is known as contact dermatitis. Blisters can also
Blister
Tart drink made from sumac
Plants Database". plants.usda.gov. Retrieved 2025-12-30. "Poison Ivy Rash, Poison Oak, Poison Sumac: Symptoms, Causes & Treatment". Cleveland Clinic. Archived
Sumac-ade
Manufacturer of over-the-counter pharmaceutical dermatological preparations
headquartered in Albany, Oregon. The company's products, including its flagship poison oak scrub, Tecnu, are sold in approximately 47,000 retail outlets which have
Tec_Laboratories
Pain scale for insect stings
cicada killer Sphecius grandis North America Pain at first sight. Like poison oak, the more you rub, the worse it gets. 1.5 wasp n/a Eumeninae sp. (A yellow
Schmidt_sting_pain_index
Park in Orange County, United States
park to its present size. Many flora and fauna can be sighted, such as poison oak, bobcats and mountain lions, which are very rare. The Acjachemen village
O'Neill_Regional_Park
Species of oak tree
Oemleria cerasiformis, poison-oak Toxicodendron diversilobum, English holly Ilex aquifolium, bird cherry Prunus avium). Conversely, oak groves in wetter areas
Quercus_garryana
Subspecies of deer
harsh weather. One of the plants that black-tailed deer browse is western poison oak, despite its irritant content. This deer often is most active at dawn
Black-tailed_deer
Inflammation from allergen or irritant exposure
urushiol-containing coating from plants of the genus Toxicodendron: poison ivy, poison oak, and poison sumac. Millions of cases occur each year in North America
Contact_dermatitis
Forest type
Understory flora associates include Toyon and Western poison oak. Environment portal California oak woodland Mixed conifer forest B. Harper-Lore, 2000 Garrison
Cedar hemlock douglas-fir forest
Cedar_hemlock_douglas-fir_forest
Species of flowering plant in the cashew family Anacardiaceae
exposed to other plants from the family Anacardiaceae, such as poison oak and poison ivy, which are widespread in the United States. The wood is known
Mangifera_indica
Tropical fruit
contact dermatitis induced by urushiol (an allergen found in poison ivy, poison oak, or poison sumac) may be most at risk for mango contact dermatitis. Other
Mango
Genus of flowering plants in the birch family
Some Native American cultures use red alder bark (Alnus rubra) to treat poison oak, insect bites, and skin irritations. Blackfeet Indians have traditionally
Alder
Species of beetle
America (California, Oregon), where it inhabits deciduous forests and poison-oak thickets. Adults are brachypterous, gregarious and nocturnal. "Scaphinotus
Scaphinotus_ventricosus
deposits supporting northern coastal scrub including thick growth of poison oak. The beach is suitable for recreational fishing and swimming at your own
Pinnacle and Shorttail Gulch Coastal Access Trails
Pinnacle_and_Shorttail_Gulch_Coastal_Access_Trails
American writer, outdoorsman, and health food advocate
Plants (1979) Hauser, Susan Carol (2008-04-01). Field Guide to Poison Ivy, Poison Oak, and Poison Sumac: Prevention And Remedies. Rowman & Littlefield. ISBN 9781461746775
Euell_Gibbons
Species of bird
insects that tried to take refuge in them. They have also been known to eat poison oak seeds and manzanita fruit. They may also forage around the sides of human
Pileated_woodpecker
2008 film
are flanked by Natives who shoot and kill Clay. They escape by burning poison oak to ward off the attackers, but are soon attacked by the Burrowers who
The_Burrowers
Member of the woodpecker family
eat berries and seeds, especially in winter, including those of poison ivy, poison oak, dogwood, sumac, wild cherry, and grape, bayberries, hackberries
Northern_flicker
Change of the skin that affects its color, appearance, or texture
hygiene Uncommon causes: Autoimmune disorders such as psoriasis Lead poisoning Pregnancy Repeated scratching on a particular spot Lyme disease Scarlet
Rash
Temperate coniferous forests ecoregion in northern California and southwestern Oregon
salal (Gaultheria shallon), Sadler's oak (Quercus sadleriana), dwarf Oregon-grape (Mahonia nervosa), and poison oak (Toxicodendron diversilobum) are typically
Northern California coastal forests
Northern_California_coastal_forests
Species of flowering plant in the laurel family Lauraceae
massage therapy and aromatherapy. A folk remedy for rashes caused by poison ivy, poison oak, and stinging nettle is a poultice soaked in boiled bay leaves.
Laurus_nobilis
Former Tongva village in Los Angeles, California
in contemporary sources as being a Tongva word meaning "place of the poison oak." The original exact site of Yaanga is unclear because the village was
Yaanga
poisonous fungus species List of venomous animals Biopesticide Mushroom poisoning Poison garden Secondary metabolite Toxin Weed Keddy, P.A. 2007. Plants and
List_of_poisonous_plants
Species of moth
folding the tips of the leaves, and feeding within. The larvae feed on poison oak (Toxicodendron diversilobum). Global Taxonomic Database of Gracillariidae
Caloptilia_diversilobiella
Skin protectant and topical analgesic
the oozing and weeping of irritation caused by contact with poison ivy, poison oak, and poison sumac. Adults and children that are two years of age or older
Resinol
species in these California pine–cypress forests include salal and western poison oak. Many of the Florida occurrences of pine–cypress forest are in swampy
Pine–cypress_forest
Astringent and antibacterial treatment
astringent it is used for the relief of skin irritations due to poison ivy, poison oak, and poison sumac, and rashes from allergic reactions to soaps, detergents
Burow's_solution
Related species of plants in the family Anacardiaceae
such as poison ivy (Toxicodendron radicans, syn. Rhus toxicodendron), poison oak (Toxicodendron diversilobum, syn. Rhus diversiloba), and poison sumac (Toxicodendron
Sumac
Mountain in Washington (state), United States
yellow fawn lily, balsamroot, and Columbia kittentails. Hazards include poison oak, rattlesnakes, scorpions, and steep slopes. The trail's difficulty caused
Dog_Mountain
2025 American television series
to support Chloe's team called "The Big Brain Theory" while mistaking poison oak for a four-leaf clover and admits that he wanted to be on the team because
The_Thundermans:_Undercover
Topics referred to by the same term
oak Casuarina, she-oak Casuarina glauca, swamp oak Lagunaria, white oak Grevillea robusta, silky oak Silky oak (disambiguation) Toxicodendron, poison
Oak_(disambiguation)
Species of tree
arbutifolia), skunkbush (Rhus trilobata), redberry (Rhamnus crocea), and western poison oak (Toxicodendron diversilobum). In brushy mountain habitat it grows among
Frangula_californica
Steroid medication
sarcoidosis, to relieve the effects of shingles, lupus, myasthenia gravis, poison oak exposure, Ménière's disease, autoimmune hepatitis, giant cell arteritis
Prednisone
Park in California
perfoliata) Poison oak (Toxicodendron diversilobum) Sticky monkey flower (Diplacus aurantiacus) Western sword fern (Polystichum munitum) Tanbark oak (Notholithocarpus
Uvas_Canyon_County_Park
Tree or shrub in the genus Quercus
H. Freeman and Company. p. 73. ISBN 0716718081. Dun, Kath (2006). "Oak poisoning in cattle". UK Vet Livestock. 11 (5): 47–50. doi:10.1111/j.2044-3870
Oak
American baseball player (1876–1908)
Henry Charles Krug (December 4, 1876 – January 14, 1908) was an American professional baseball player. He played in Major League Baseball (MLB) for the
Henry_Krug
Property in the state park system of California
tanks, until the trail fades into the dense growth of stinging nettles, poison oak, and coyote brush. Burleigh H. Murray was born on the ranch July 19, 1865
Burleigh_H._Murray_Ranch
manzanita Pink honeysuckle Pink spineflower Pinto violet Playa phacelia Poison oak Ponderosa pine Port Orford cedar Prettyface Prostrate buckwheat Pygmy
List_of_native_Oregon_plants
Inflammation of the skin due to contact with an allergen
Urushiol – oily coating from plants of Toxicodendron genus – poison ivy, poison oak, and poison sumac. Also found in mango plants, mango skin, cashews, and
Allergic_contact_dermatitis
Unincorporated community in California, United States
There are few lawns: most homes have redwood duff in the front yard. Poison oak is evident in the area. There are very few storm drains, curbs, or sidewalks
Redwood_Estates,_California
Series of homicides in the U.S. state of Michigan
motorcycles; her nude, strangled body was found discarded in a patch of poison oak on July 13, with the distinctive red-and-white floral patterned belt from
Michigan_Murders
remedy in the treatment of contact dermatitis caused by exposure to poison ivy, poison oak, and other oil-transmitted organic skin-irritants. The soap is still
Joseph_Fels
Subfamily of flowering plants
Semecarpus Smodingium Sorindeia Swintonia Thyrsodium Toxicodendron – poison oak and poison ivy Trichoscypha "Anacardioideae". BioLib. Retrieved 14 Jul 2015
Anacardioideae
1941 song by Horace Heidt and His Musical Knights
finds them and, to prevent the incident from happening again, "plant(s) poison oak all along the stream." The children end up back at school. To explain
The_Hut-Sut_Song
Language family of California, US
act (2) (with extent?) *-ma plural number *-aya poison, poisoning song *q̓oˑʔó ~ *q̓oʔóˑ poison oak *hmaˑṭi̇́yu ~ *maˑṭi̇́yuho ? potato, Indian *hiʔbúnʸ
Pomoan_languages
American baseball player (1875–1945)
Joseph Aloysius Corbett (December 4, 1875 – May 2, 1945) was an American Major League Baseball starting pitcher who played in the National League. He was
Joe_Corbett
Evergreen oak tree native to California
The coast live oak (Quercus agrifolia), also called the California live oak, is a live oak (a semi-evergreen oak) native to the California Floristic Province
Quercus_agrifolia
Rhus aromatica (skunk bush) Toxicodendron (poison oak, poison ivy) Toxicodendron diversilobum (western poison oak) Apiaceae, carrot family Bowlesia Bowlesia
List of flora of the Mojave Desert region
List_of_flora_of_the_Mojave_Desert_region
Skin disease characterized by red, raised, and itchy bumps
be associated with urticaria. The rash that develops from poison ivy, poison oak, and poison sumac contact is commonly mistaken for urticaria. This rash
Hives
Species of plant
exposed to other plants from the family Anacardiaceae, such as poison oak and poison ivy, which are widespread in the United States. In Florida growth
Spondias_purpurea
Mountain in California, United States
characterized by coastal sage-coyote brush association, with lesser amounts of poison-oak, bush monkeyflower, California blackberry, western bracken fern, and various
Mount_Tamalpais
Temperate coniferous forests ecoregion in northern California and southwestern Oregon
Western poison-oak, snowberry, Idaho fescue, California brome, roughstalk bluegrass, and ceanothus. The region is lower and less dissected, with more oak woodland
Klamath_Mountains_(ecoregion)
Stream in San Francisco, California, US
a site hardly anybody knew about it," Kern said. "We went down in the poison oak, found the concrete and the debris, and asked the Army to go in and test
Coyote_Gulch_(California)
Species of domesticated mammal
not easily removed by humans, including (thorned) blackberry vines and poison oak. Chattanooga, TN and Spartanburg, SC have used goats to control kudzu
Goat
Type of claystone, composed of absorbent smectite clay minerals
against exposure to urushiol, the oil found in plants such as poison ivy or poison oak. Bentonite can also be used as a desiccant due to its adsorption
Bentonite
American financier (1915–2009)
scheduled to participate in the Normandy Invasion (D-Day), but a case of poison oak kept him out of the invasion's early stages. He was wounded in battle
Carl_Pohlad
Species of butterfly
which belong to the family Fabaceae. These host plants are found within, "poison oak, willow, and near streambanks. During the larva and pupal stages, the
Zerene_eurydice
Minor league baseball team
19th and early 20th centuries. The first team, known as the Petaluma Poison Oaks played in the California Players' League in 1894. A second team played
Petaluma_Baseball_Team
Uncomfortable skin sensation
contact with specific chemicals, such as urushiol, derived from poison ivy or poison oak, or Balsam of Peru, found in many foods and fragrances. Certain
Itch
Temperate broadleaf and mixed forests ecoregion of the United States
ash, Douglas-fir, bigleaf maple, black cottonwood, and an understory of poison-oak, hazel, and Indian plum, with some Ponderosa pine to the south. Today
Willamette_Valley_(ecoregion)
Type of allergic reaction
contact dermatitis Environmental chemicals, like urushiol (from poison ivy and poison oak), metals (e.g. nickel), topical medication epidermal necrosis
Type_IV_hypersensitivity
2008 film
when he gets them lost in the woods, to when he becomes swollen from poison oak when he uses it as a badge on the beaver, and to when he attempts to teach
Surviving_Sid
Common name for many species of genus Arctostaphylos
Americans in Northern California make a tisane from manzanita leaves to treat poison oak rash. The leaves contain chemicals with a mildly disinfectant quality
Manzanita
2011 film by Q. Allan Brocka
his relationship with Zack, leading to Penny secretly rubbing Zack with poison oak so he can not rehearse. Casey stands in for Zack, and is shocked to find
Eating_Out:_Drama_Camp
Volcanic plug in San Luis Obispo, California, United States
an Oak woodland, sage scrub and chaparral. Woodland areas are composed of species like coast live oak and California bay trees, as well as poison oak and
Bishop_Peak_(California)
Season of television series
source, poison ivy, is not found near Los Angeles. However, the same allergen is produced by other toxicodendron species including poison oak, which is
Columbo_season_3
Former detention center in Pennsylvania, United States
experimentation with biological agents including Hong Kong flu, poison ivy and poison oak. So common was the experimentation that in the 1,200-person prison
Holmesburg_Prison
Herbicide
native species, and also to control many poisonous weeds such as poison ivy and poison oak. A 2010 monitoring study conducted in the US and Canada found
2,4-Dichlorophenoxyacetic acid
2,4-Dichlorophenoxyacetic_acid
Nature preserve in California, United States
agrifolia), California black walnut (Juglans californica) and western poison oak (Toxicodendron diversilobum). At the park's lower elevation, a year-round
Oak_Canyon_Nature_Center
Family of flowering plants that includes cashew and mango
Tapirira Aubl. Thyrsodium Salzm. ex Benth. Toxicodendron Mill. – poison ivy, poison oak, poison sumac Trichoscypha Hook.f. Tumultivenia J.D.Mitch. & Daly Uniostium
Anacardiaceae
POISON OAK
POISON OAK
Surname or Lastname
English
English : patronymic from Penn 3 or Paine 1.English : habitational name from Penson in Devon.
Girl/Female
Biblical
Changing, extension of the mouth.
Surname or Lastname
English (Midlands)
English (Midlands) : habitational name from Pointon in Lincolnshire, Poynton in Cheshire, or Poynton Green in Shropshire. The first is named from Old English Pohhingtūn ‘settlement (Old English tūn) associated with Pohha’, a byname apparently meaning ‘bag’; the others have as the first element the Old English personal names Pofa and Pēofa respectively.
Female
Welsh
 Diminutive form of Welsh Alis, ALISON means "noble sort." Compare with another form of Alison.
Surname or Lastname
English
English : from Middle English persone, parsoun ‘parish priest’, ‘parson’ (Old French persone, from Latin persona ‘person’, ‘character’), hence a status name for a parish priest or perhaps a nickname for a devout man. The reasons for the semantic shift from ‘person’ to ‘priest’ are not certain; the most plausible explanation is that the local priest was regarded as the representative person of the parish. The phonetic change from -er- to -ar- was a regular development in Middle English.Americanized form of one or more like-sounding Jewish names.Americanized spelling of Swedish Pärsson, Persson (see Persson).
Male
English
English surname transferred to forename use, EDISON means "son of Eda."
Surname or Lastname
English
English : unexplained.
Female
Scottish
 Norman French form of Old High German Adalheid, ALISON means "noble sort." In use by the English and Scottish.
Female
English
 Norman French form of Old High German Adalheid, ALISON means "noble sort." In use by the English and Scottish. Compare with another form of Alison.
Surname or Lastname
English, Scottish, and French
English, Scottish, and French : nickname for an intelligent person, from Middle English, Old French raison ‘reasoning’, ‘intellectual faculty’ (Latin ratio, genitive rationis).
Surname or Lastname
English and French
English and French : from Old French pinson ‘finch’, perhaps a nickname applied to a bright and cheerful person.English and French : metonymic occupational name for someone who made pincers or forceps or who used them in their work, from Old French pinson ‘pincers’ (a derivative of pincier ‘to pinch’).
Surname or Lastname
English
English : variant of Hobson.
Male
English
Variant spelling of English unisex Addison, ADISON means "son of Adam."
Surname or Lastname
English
English : topographic name for someone who lived by a postern gate, from Old French posterne; in some cases it would have been a metonymic occupational name for a gatekeeper.English : habitational name from Poston in Herefordshire or Poston in Shropshire, which is named with an Old English personal name Possa + þorn ‘thorn tree’.
Surname or Lastname
English
English : possibly a variant of Godson (see Goodson) or a patronymic from the personal name Gotte (see Gott).
Surname or Lastname
Scottish and northern Irish
Scottish and northern Irish : variant of Curzon.English (of Norman origin) : nickname from Old French corson, a diminutive of curt ‘short’ (see Court).
Male
Greek
(Φίλων) Greek name derived from the word phileo, PHILON means "to love."
Surname or Lastname
English
English : apparently a variant spelling of Lewison.
Surname or Lastname
English
English : patronymic or metronymic from Eade.The inventor Thomas Alva Edison, born in 1847 in Milan, OH, came from a Canadian family first established in North America by John Edison, a loyalist during the American Revolution, who served under the British General Richard Howe and went into exile in Nova Scotia after the Revolutionary War.
Biblical
changing; extension of the mouth
POISON OAK
POISON OAK
POISON OAK
POISON OAK
POISON OAK
POISON OAK
POISON OAK