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Plant Database

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Toxicodendron rydbergii (Western poison ivy)
Hixson, John

Toxicodendron rydbergii

Toxicodendron rydbergii (Small ex Rydb.) Greene

Western Poison Ivy

Anacardiaceae (Sumac Family)

Synonym(s): Rhus radicans var. rydbergii, Rhus radicans var. vulgaris, Rhus toxicodendron var. vulgaris, Toxicodendron desertorum, Toxicodendron radicans var. rydbergii


USDA Native Status: L48 (N), CAN (N)

Western Poison Ivy is a member of the cashew family (family Anacardiaceae) which includes trees, shrubs, and few woody vines with resinous sap often in bark and other parts; in a few species the resin or volatile oil is caustic and poisonous to the skin.


From the Image Gallery

8 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Shrub
Autumn Foliage: yes

Bloom Information

Bloom Color: White , Yellow


USA: AZ , CO , CT , DE , IA , ID , IL , IN , KS , MA , MD , ME , MI , MN , MT , NC , ND , NE , NH , NM , NV , NY , OH , OK , OR , PA , RI , SD , TX , UT , VA , VT , WA , WI , WV , WY
Canada: AB , BC , MB , NB , NS , ON , PE , QC , SK , YT

Growing Conditions

Light Requirement: Sun , Part Shade , Shade

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Additional resources

USDA: Find Toxicodendron rydbergii in USDA Plants
FNA: Find Toxicodendron rydbergii in the Flora of North America (if available)
Google: Search Google for Toxicodendron rydbergii


Record Modified: 2015-02-11
Research By: TWC Staff

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