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Toxicodendron rydbergii

(Small ex Rydb.) Greene

Northern Poison-oak

G5Secure Found in 117 roadless areas NatureServe Explorer →
G5SecureGlobal Rank
Identity
Unique IDELEMENT_GLOBAL.2.132421
Element CodePDANA0B030
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderSapindales
FamilyAnacardiaceae
GenusToxicodendron
Synonyms
Rhus radicans ssp. rydbergii(Small ex Rydb.) McNeillRhus radicans var. rydbergii(Small ex Rydb.) Rehd.Toxicodendron radicans var. rydbergii(Small ex Rydberg) Erskine
Other Common Names
Herbe à puce de Rydberg (FR) Rydberg's Poison Ivy (EN) Western Poison-ivy (EN) western poison-ivy (EN)
Concept Reference
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Taxonomic Comments
Recognized as a distinct species by Gillis (1971) and by Kartesz (1980, 1994, 1999), but usually included in Rhus/Toxicodendron radicans in older floras. Toxicodendron rydbergii more closely resembles poison oak than poison ivy in its upright growth form and lack of aerial rootlets. Larry Morse, 15Nov99.
Conservation Status
Rank MethodExpertise without calculation
Review Date2016-05-16
Change Date1984-09-06
Ecology & Habitat
Other Nations (2)
CanadaN5
ProvinceRankNative
New BrunswickS5Yes
Yukon TerritoryS1Yes
Nova ScotiaS5Yes
British ColumbiaS5Yes
OntarioS5Yes
Prince Edward IslandS4Yes
ManitobaS5Yes
AlbertaS3Yes
SaskatchewanS4Yes
QuebecS5Yes
United StatesN5
ProvinceRankNative
IdahoSNRYes
IllinoisSNRYes
North CarolinaSNRYes
ArizonaSNRYes
IowaS4Yes
MinnesotaSNRYes
IndianaSNRYes
DelawareSNRYes
MassachusettsSNRYes
OhioS1Yes
South DakotaSNRYes
VermontS5Yes
New HampshireSNRYes
Rhode IslandSNRYes
VirginiaS1Yes
WashingtonSNRYes
UtahSNRYes
KansasS4Yes
New YorkS3Yes
NebraskaSNRYes
OklahomaSNRYes
MaineSNRYes
WyomingS4Yes
MichiganSNRYes
New MexicoSNRYes
North DakotaSNRYes
West VirginiaS1Yes
PennsylvaniaS1Yes
WisconsinSNRYes
TexasSNRYes
MontanaS5Yes
ColoradoS4Yes
MarylandSNRYes
ConnecticutSNRYes
Plant Characteristics
Economic Value (Genus)No
Roadless Areas (117)
Arizona (17)
AreaForestAcres
BoulderTonto National Forest40,359
Butterfly Roadless AreaCoronado National Forest42,296
CenterfireApache-Sitgreaves National Forests13,130
ChiricahuaCoronado National Forest76,876
Connell MountainsPrescott National Forest7,926
Hot AirApache-Sitgreaves National Forests31,712
Lower San FranciscoApache-Sitgreaves National Forests59,310
MazatzalTonto National Forest16,942
Mitchell PeakApache-Sitgreaves National Forests35,398
NolanApache-Sitgreaves National Forests6,780
Oracle RoadlessCoronado National Forest22,365
Painted BluffsApache-Sitgreaves National Forests43,118
PicachoTonto National Forest4,969
PinalenoCoronado National Forest130,920
PipestemApache-Sitgreaves National Forests34,598
Sierra Ancha Wilderness ContiguousTonto National Forest7,787
SunsetApache-Sitgreaves National Forests28,948
Colorado (3)
AreaForestAcres
Comanche Peak Adjacent AreaArapaho & Roosevelt NFs44,158
HermosaSan Juan NF148,103
Storm PeakSan Juan NF57,617
Idaho (1)
AreaForestAcres
HoodooNez Perce-Clearwater National Forest153,868
Minnesota (1)
AreaForestAcres
Hegman LakesSuperior National Forest675
Montana (19)
AreaForestAcres
Alexander Creek #696Kootenai National Forest6,719
Bear - Marshall - Scapegoat - SwanLewis and Clark National Forest344,022
Big LogHelena National Forest8,954
Big Snowy Mountains WsaLewis and Clark National Forest88,003
Bmss Ra 1485Flathead National Forest334,275
Cabinet Face East #671Kootenai National Forest50,326
Cube Iron - SilcoxLolo National Forest36,998
Fishtail SaddlebackCuster National Forest16,359
HolterHelena National Forest1,965
HoodooLolo National Forest105,162
Lebeau RA 1507Flathead National Forest5,450
MadisonGallatin National Forest127,859
North AbsarokaCuster National Forest21,063
North AbsarokaGallatin National Forest159,075
QuiggBeaverhead-Deerlodge National Forest12,712
Red Lodge Creek HellroaringCuster National Forest17,210
Silver KingBeaverhead-Deerlodge National Forest64,289
Silver KingLolo National Forest12,816
Tenderfoot - Deep CreekLewis and Clark National Forest85,614
Nevada (1)
AreaForestAcres
Moriah - Hendrys Ck.Humboldt-Toiyabe National Forest2,345
New Mexico (24)
AreaForestAcres
Alamo CanyonSanta Fe National Forest8,639
Aspen MountainGila National Forest23,784
Candian RiverCibola National Forest7,149
Columbine - Hondo Wilderness Study AreaCarson National Forest43,739
Contiguous To Black & Aldo Leopold WildernessGila National Forest111,883
Contiguous To Gila Wilderness & Primitive AreaGila National Forest79,049
Devils CreekGila National Forest89,916
Gila BoxGila National Forest23,759
Grass MountainSanta Fe National Forest3,254
Hell HoleGila National Forest19,553
Holy GhostSanta Fe National Forest2,352
Last Chance CanyonLincoln National Forest8,934
Lower San FranciscoGila National Forest26,460
Meadow CreekGila National Forest34,167
NolanGila National Forest13,051
Pecos WS RiverSanta Fe National Forest5,396
RendijaSanta Fe National Forest2,176
Ryan HillCibola National Forest34,201
Sawyers PeakGila National Forest59,743
South Guadalupe MountainsLincoln National Forest20,930
Thompson PeakSanta Fe National Forest33,001
Virgin CanyonSanta Fe National Forest6,068
West Face Sacramento MountainsLincoln National Forest41,176
White CapCibola National Forest8,036
North Dakota (4)
AreaForestAcres
Long X DivideDakota Prairie Grasslands10,099
Ponderosa PineDakota Prairie Grasslands7,471
SheyenneDakota Prairie Grasslands14,537
WannaganDakota Prairie Grasslands6,026
Oregon (6)
AreaForestAcres
BuckhornWallowa-Whitman National Forest17,180
Cook RidgeWallowa-Whitman National Forest19,617
Imnaha FaceWallowa-Whitman National Forest29,575
Mcclellan MountainMalheur National Forest21,213
Mountain SheepWallowa-Whitman National Forest19,457
Snake RiverWallowa-Whitman National Forest31,229
South Dakota (1)
AreaForestAcres
Indian CreekBuffalo Gap National Grassland24,666
Utah (29)
AreaForestAcres
0401002Ashley National Forest36,113
0401004Ashley National Forest10,510
0401005Ashley National Forest38,930
0401023Ashley National Forest8,352
0401032Ashley National Forest6,471
0419020Ashley National Forest355,684
418012Uinta National Forest25,758
418014Uinta National Forest9,683
418015Uinta National Forest17,289
418016Uinta National Forest35,240
418024Uinta National Forest51,699
418025Uinta National Forest32,698
418027Uinta National Forest13,884
Box - Death HollowDixie National Forest3,175
Burch CreekWasatch-Cache National Forest6,938
CottonwoodDixie National Forest6,754
Lewis PeakWasatch-Cache National Forest11,616
Lone Peak ContiguousWasatch-Cache National Forest874
Middle FrancisWasatch-Cache National Forest3,296
Mt. Logan NorthWasatch-Cache National Forest18,930
Mt. Logan SouthWasatch-Cache National Forest17,014
Mt. NaomiWasatch-Cache National Forest41,922
Mt. OlympusWasatch-Cache National Forest9,982
North FrancisWasatch-Cache National Forest8,148
PavantFishlake National Forest42,560
Pine Valley MountainsDixie National Forest57,673
South FrancisWasatch-Cache National Forest3,374
Twin PeaksWasatch-Cache National Forest6,157
WellsvilleWasatch-Cache National Forest1,717
Vermont (2)
AreaForestAcres
Griffith Lake 09084Green Mountain and Finger Lakes National Forests1,833
Wilder Mountain 09082Green Mountain and Finger Lakes National Forests8,759
Washington (4)
AreaForestAcres
Abercrombie - HooknoseColville National Forest33,862
Alpine Lakes Adj.Wenatchee National Forest57,104
Black CanyonOkanogan National Forest9,681
Salmo - Priest BColville National Forest11,869
Wyoming (5)
AreaForestAcres
Laramie PeakMedicine Bow-Routt National Forest28,608
Little BighornBighorn National Forest133,949
Middle ForkShoshone National Forest51,772
Piney CreekBighorn National Forest22,240
Walker PrairieBighorn National Forest62,434
References (1)
  1. Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.