Ceratocephala orthoceras, Ranunculus testiculatus) is a flowering plant that is native to Eurasia.

[1] Common names include bur buttercup and curveseed butterwort.

[2] Where they are present in large numbers, it is usually an indication of excessive disturbance to the land.

The species is considered to be invasive in the northern and western United States.

In the sagebrush country, it is one of the first plants to flower after the snow melts.