Eriocapitella rivularis

About

Eriocapitella rivularis, a species of flowering plant in the buttercup family Ranunculaceae, is native to Asia. The specific epithet rivularis means "waterside, of the rivers", which evidently refers to one of its preferred habitats. It is commonly called the riverside windflower. In Chinese, it is called cǎoyùméi (草玉梅), literally "grass jade plum".

Summary from Wikipedia