| Scientific Name | Equisetum laevigatum A. Braun |
| Family | Equisetaceae |
| Common Names | smooth scouring rush |
| Eastern Washington | Native |
| Synonyms | Equisetum funstonii A.A. Eaton Equisetum kansanum J.H. Schaffn. |
| 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., WA – 5/30/10 
Along Hwy 22 SE of Toppenish, WA 0.1 mi SE of Plank Rd; 46.30840N 120.20711W – Yakima Co., WA – 5/30/10 
Along Hwy 22 SE of Toppenish, WA 0.1 mi SE of Plank Rd; 46.30840N 120.20711W – Yakima Co., WA – 5/30/10 
Along Hwy 22 SE of Toppenish, WA 0.1 mi SE of Plank Rd; 46.30840N 120.20711W – Yakima Co., WA – 5/30/10 
Along Lamont Rd, 0.63 mi SW of Hwy 23. NE edge of Lamont, WA; N 47.20524 W 117.90172; Whitman Co.; 5/23/2018 
Along Lamont Rd, 0.63 mi SW of Hwy 23. NE edge of Lamont, WA; N 47.20524 W 117.90172; Whitman Co.; 5/23/2018 
Along Lamont Rd, 0.63 mi SW of Hwy 23. NE edge of Lamont, WA; N 47.20524 W 117.90172; Whitman Co.; 5/23/2018 
Along Lamont Rd, 0.63 mi SW of Hwy 23. NE edge of Lamont, WA; N 47.20524 W 117.90172; Whitman Co.; 5/23/2018 
Along Lamont Rd, 0.63 mi SW of Hwy 23. NE edge of Lamont, WA; N 47.20524 W 117.90172; Whitman Co.; 5/23/2018 
Along Lamont Rd, 0.63 mi SW of Hwy 23. NE edge of Lamont, WA; N 47.20524 W 117.90172; Whitman Co.; 5/23/2018 
Along Lamont Rd, 0.63 mi SW of Hwy 23. NE edge of Lamont, WA; N 47.20524 W 117.90172; Whitman Co.; 5/23/2018 
Along Lamont Rd, 0.63 mi SW of Hwy 23. NE edge of Lamont, WA; N 47.20524 W 117.90172; Whitman Co.; 5/23/2018