血水草属（学名：Eomecon）是罂粟科下的一个属，为多年生草本植物。该属仅有血水草（Eomecon chionantha）一种，分布于中国中部和南部各地。

Eomecon is a monotypic genus of flowering plants in the poppy family containing the single species Eomecon chionantha. Its common names include snow-poppy and dawn-poppy. It is endemic to China.

This perennial herb produces stolons from its branching rootstock, spreading to form patches on the ground. Its roots are orange. The leaves are all basal, borne on bluish petioles up to 30 centimeters long. The leaf blades are heart-shaped or kidney-shaped, with wavy, scalloped edges. They are greenish, sometimes with a purple tinge on the undersides. They are up to 26 centimeters long by 20 wide. The scape is blue-gray with a mauve tint. It grows up to 40 centimeters tall and bears 3 to 5 flowers. The flower bud is about a centimeter long and pointed. The open flower has two membranous sepals that join to form a spathe. The four white petals are up to 2.5 centimeters long and are arranged in two layers. At the center of the flower are over 70 stamens with yellow anthers. The fruit is a capsule about 2 centimeters long.