Ethulia uniflora Walter Sclerolepis is an aquatic plant native to the eastern United States.

When water is abundant, the plant lives underwater, with long stems and flaccid, elongated leaves, and does not flower.

When the water level drops, it assumes a form more familiar in terrestrial plants, with an erect stem, and flowers in summer to fall.

[2][3][4] Sclerolepis is fairly common in the southeastern United States, from Alabama and Florida to North Carolina, and has more sparse distribution as far north as New Hampshire.

It is thought to be related to two other aquatic genera in this tribe, Shinnersia and Trichocoronis.