Utah Valley University Herbarium


Accession # 00229 
Family - UVUAPG III FamilyCronquist FamilyA Utah Flora
Species Toxicodendron rydbergii (Small ex Rydb.) Greene
Common name   western poison ivy
S. Hatfield   56  
Coll. Date 07 June 1989 
United States
Utah County
Locality Hobble Creek Canyon, Balsam campground.
Climate NCDC temperatures, daily high (red), daily average (green) and daily low (blue), from 1970 to 2000 at this location.   NCDC average monthly precipitation from 1970 to 2000 at this location.
Latitude Longitude 40° 11'  40" N, 111° 21'  34" W
Township Range T7S, R5E  
Datum Not recorded
Uncertainty Not calculated
TRS Notes Latitude and longitude were derived from township and range information and may be
inaccurate by as much as 0.7 miles (or 4.2 miles if the section is not given).


Synonyms recognized by ITIS (bold taxon is currently accepted):

     Toxicodendron rydbergii (Small ex Rydb.) Greene

     Rhus radicans var. rydbergii (Small ex Rydb.) Rehd.
     Rhus radicans var. vulgaris (Michx.) DC.
     Rhus toxicodendron var. vulgaris Michx.
     Toxicodendron desertorum Lunell
     Toxicodendron radicans var. rydbergii (Small ex Rydb.) Erskine

Common Name(s): poison ivy, W. Poison ivy, western poison ivy, western poison-ivy.

Taxonomic Hierarchy: (ITIS TSN=28822, click for more information and references)

        Kingdom: Plantae
            Subkingdom: Tracheobionta
                Division: Magnoliophyta
                    Class: Magnoliopsida
                        Subclass: Rosidae
                            Order: Sapindales
                                Family: Anacardiaceae
                                    Genus: Toxicodendron
                                        Species: Toxicodendron rydbergii


Available images of this specimen (click to view):
specimen image: 00229s2.jpg

Images of other samples of the same species:
specimen image: 03083s2.jpg 
specimen image: 07719s2.jpg 
specimen image: 08014s2.jpg 

Nearby Accessions

Other accessions in the database collected near this one:

Accession Name Dist., dir.
00201 Astragalus beckwithii  var. beckwithii   "Beckwith's milkvetch" same section
00228 Corallorhiza striata      "striped coralroot" same section
00202 Cornus sericea      "redosier dogwood" same section
00206 Cystopteris fragilis      "brittle bladder fern" same section
00209 Mitella stauropetala  var. stenopetala   "drywoods miterwort" same section
00211 Montia perfoliata  var. perfoliata  same section
00205 Physocarpus malvaceus      "mallow ninebark" same section
00301 Smilacina racemosa      "false Solomon's Seal" same section
00208 Viola adunca      "hook-spur violet" same section


Nearby locations from the USGS Geographic Name Information System (GNIS) database:

Name County Dist., dir. Elevation (ft.) 7.5' Quad Name
Clark Hollow (Valley) Utah County, UT 1.3 mi. NW   Two Tom Hill 
Jux Canyon (Valley) Utah County, UT 1.3 mi. W   Two Tom Hill 
Pumphouse Hill (Summit) Utah County, UT 1.7 mi. S 8183  Two Tom Hill 
Timber Mountain (Summit) Utah County, UT 1.9 mi. S 7943  Two Tom Hill 
Packard Creek (Stream) Utah County, UT 1.5 mi. W   Granger Mountain 
Pump Ridge (Ridge) Utah County, UT 2 mi. S 7743  Two Tom Hill 
Upper Clark Hollow (Valley) Utah County, UT 2.1 mi. N   Two Tom Hill 
Halls Fork (Stream) Utah County, UT 1.7 mi. E   Two Tom Hill 
Shingle Mill Fork (Stream) Utah County, UT 1.7 mi. E   Twin Peaks 
Chase Creek (Stream) Utah County, UT 1.7 mi. E   Two Tom Hill 
Wardsworth Creek (Stream) Utah County, UT 1.8 mi. W   Twin Peaks 
Balsam Campground (Locale) Utah County, UT 2.3 mi. W 5916  Granger Mountain 
Mollies Nipple (Summit) Utah County, UT 3 mi. S 7651  Two Tom Hill 
Diamond Fork Guard Station (Locale) Utah County, UT 2.9 mi. SE 6306  Two Tom Hill 
Thorn Hollow (Valley) Utah County, UT 3.2 mi. N   Twin Peaks 
Springville Crossings (Locale) Utah County, UT 3.1 mi. SE 6296  Two Tom Hill 
Slab Canyon (Valley) Utah County, UT 2.8 mi. E   Two Tom Hill 
Yellowjacket Creek (Stream) Utah County, UT 2.8 mi. E   Two Tom Hill 
Sawmill Hollow (Valley) Utah County, UT 3.8 mi. S   Two Tom Hill 
Farmer Slope (Slope) Utah County, UT 3.6 mi. SE 6710  Two Tom Hill 


Taxon Links for species Toxicodendron rydbergii  (Small ex Rydb.) Greene

CalPhotos, Berkeley Digital Library Project

CNPS Manual of California Vegetation Database

USDA Plants database
University of Washington Herbarium: Plants of Washington (images)

Texas A&M University: Image Library (images)

Lady Bird Johnson's Wildflower Center

Google Images

External link to this species in the UVU Herbarium:

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