Hottonia palustris, also water violet or featherfoil, is an aquatic plant in the family Primulaceae.

The leaves are deeply divided as far as the central vein, like the teeth of a double comb, and are completely submerged, but can surface after a drastic fall in water level.

[citation needed] Featherfoil is found in Europe and northern Asia.

The species epithet palustris is Latin for "of the marsh" and indicates its common habitat.

[1] Naturally a bog or marsh plant, most specimens sold have been grown emersed and must be submerged in stages in the aquarium to encourage them to adapt and form submerse leaves.