Host an Event Volunteer Join Tickets

Support the plant database you love!


Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

Enter a Plant Name:
Or you can choose a plant family:
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 sumac 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: Herb , Subshrub , Shrub , Vine
Fruit Type: Drupe
Size Notes: Usually found shrub-like, up to about 10 feet tall.
Autumn Foliage: yes

Bloom Information

Bloom Color: White , Yellow
Bloom Time: May , Jun


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
Soil Moisture: Dry , Moist

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.

Web Reference

Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

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: 2023-01-18
Research By: TWC Staff

Go back