| Scientific Name | Ceratocephala testiculata (Crantz) Bess. |
| Family | Ranunculaceae |
| Common Names | hornseed buttercup |
| Eastern Washington | Introduced |
| Conservation Status | |
| Notes |
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Near the Keller Ferry landing – Linclon Co., WA – 4/23/2010 
Near the Keller Ferry landing – Linclon Co., WA – 4/23/2010 
Near the Keller Ferry landing – Linclon Co., WA – 4/23/2010 
Near the Keller Ferry landing – Linclon Co., WA – 4/23/2010 
Near the Keller Ferry landing – Linclon Co., WA – 4/23/2010 
Near the Keller Ferry landing – Linclon Co., WA – 4/23/2010 
Ca. 6 air mi W of Cheney, WA; along Ritchey Rd ca. 0.3 mi N of Hwy 904.; N 47.45449 W 117.71492; Spokane Co.; 4/5/2017 
Ca. 6 air mi W of Cheney, WA; along Ritchey Rd ca. 0.3 mi N of Hwy 904.; N 47.45449 W 117.71492; Spokane Co.; 4/5/2017 
Ca. 6 air mi W of Cheney, WA; along Ritchey Rd ca. 0.3 mi N of Hwy 904.; N 47.45449 W 117.71492; Spokane Co.; 4/5/2017 
Ca. 6 air mi W of Cheney, WA; along Ritchey Rd ca. 0.3 mi N of Hwy 904.; N 47.45449 W 117.71492; Spokane Co.; 4/5/2017