Caltha dioneaefolia is a dwarf perennial herb, of the Buttercup Family (Ranunculaceae) with apparently seated pale yellow flowers with about seven stamens and two to three free carpels and leaves that are reminiscent of those of the Venus flytrap, but very small and with leaflike appendages on the leaf.

It occurs in the southern Andes of Chile and Argentina, including on Tierra del Fuego and Hermite Island.

The larger, lower part is folded over its mid vein, about 1⁄2 cm long, ovate or almost circular, split into left and right lobes, and concave.

The smaller, upper or inner part, which is often referred to as appendages, also consists of two ovate lobes of about 3 mm long.

Bogs near the Strait of Magellan are densely coated by patches of C. dioneaefolia, Gaimardia and Astelia, that grow in between Sphagnum and other mosses.