Aquatic, floating perennial, with fibrous roots, glabrous except sometimes in the upper part of the stems and peduncles. Stems sulcate, branched. 2-3 mm thick. Leaves petiolate, petiole usually 1-4 cm long, with two membraneous scales or auricles present near the base, blade 8-20 x 15-30 m, blade reniform to rounded reniform, 3-5-lobate to the middle or even beyond, lobes shallowly crenate or entire, or ± regularly crenate with broad rounded lobules, 3-7 mm wide at base. Peduncles (10-) 12-25 mm long, opposite, axillary. Flowers yellow, 8-13 mm in diameter. Sepals ovate or rounded-ovate, glabrous, ± 4 mm long, concave. Petals ± 5-6 mm, rounded obovate to rounded ovate. Achenes 1.5-1.9 mm, numerous, inflated, glabrous, smooth forming a big globose head, inserted in a globose sparsely hairy receptacle. Style very short, somewhat hooked at the tip.