| Scientific Name | Toxicodendron rydbergii (Small ex Rydb.) Greene |
| Family | Anacardiaceae |
| Common Names | western poison-ivy |
| Eastern Washington | Native |
| Synonyms | |
| Conservation Status | |
| Notes |
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Along Hwy 22 SE of Toppenish, WA 0.1 mi SE of Plank Rd; 46.30840N 120.20711W – Yakima Co. – 5/30/2010 
Along Hwy 22 SE of Toppenish, WA 0.1 mi SE of Plank Rd; 46.30840N 120.20711W – Yakima Co. – 5/30/2010 
Near the south edge of Kepple Lake on the Turnbull National Wildlife Refuge S. of Cheney, WA – Spokane Co. – 4/27/2003 
Along Hwy 22 SE of Toppenish, WA 0.1 mi SE of Plank Rd; 46.30840N 120.20711W – Yakima Co. – 5/30/2010 
Near the south edge of Kepple Lake on the Turnbull National Wildlife Refuge S. of Cheney, WA – Spokane Co. – Late fall
