| Scientific Name | Toxicodendron rydbergii (Small ex Rydb.) Greene |
| Family | Anacardiaceae |
| Common Names | western poison-ivy |
| Eastern Washington | Native |
| Synonyms | |
| Conservation Status | |
| Notes |
Click on any image to enlarge it.
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
Toxicodendron radicans var. rydbergii
| Scientific Name | Toxicodendron radicans (L.) Kuntze var. rydbergii (Small ex Rydb.) Erskine |
| Family | Anacardiaceae |
| Common Names | poison-ivy, western poison-ivy |
| Eastern Washington | Native |
| Conservation Status | |
| Notes |
Click on any image to enlarge it.
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 
Rock Crk Rd between Bickleton/Goldendale, WA Hwy and Hwy 14. Ca 100 yds N of Bridge at Cross Crk (Roscoe).; N 45.80584 W 120.50885; Klickitat Co.; 4/10/2011 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 
Along cliff base just S of Lower Granite Dam on the Snake River; N 46.65687 W 117.43178; Garfield Co., WA; 4/24/2015 
Rock Crk Rd between Bickleton/Goldendale, WA Hwy and Hwy 14. Ca 100 yds N of Bridge at Cross Crk (Roscoe).; N 45.80584 W 120.50885; Klickitat Co.; 4/10/2011 
Along Rogersburg rd 0.68 mi E of Joseph Crk rd; 1.3 air mi SW of Rogersburg, WA; N 46.06173 W 116.99304; Asotin Co.; 6/4/2018 
Along Rogersburg rd 0.68 mi E of Joseph Crk rd; 1.3 air mi SW of Rogersburg, WA; N 46.06173 W 116.99304; Asotin Co.; 6/4/2018