Floating leaves 1-3 x 1.5-4 cm, dentate, glabrous above, pubescent to villous below, especially on the nerves; petiole up to 10 cm long, dilated near the leaf base, villous. Sepals c. 5 mm long, ovate, villous, especially in the middle portion. Petals c. 8 mm, white. Fruit 1.3 x 1.7 cm, excluding spines; spines 4, 1-1.3 cm long, two of which are shorter.