Herbs perennial, semiaquatic. Roots fibrous, subequally thick. Stems flaccid, glabrous or sparsely appressed puberulent, slightly branched above, rooting at nodes. Stem leaves with petiole 2--3(--8) cm, glabrous or sparsely puberulent; blade 3-partite, orbicular-reniform or cordate-pentagonal, 0.5--1(--1.6) × 0.7--1.7(--2.6) cm, herbaceous, glabrous or sparsely appressed puberulent, base cordate or cordate-truncate, central lobe rhombic-cuneate or broadly rhombic, 3-lobed, lobules entire, obtuse; lateral lobes obliquely flabellate, unequally 2-lobed nearly to middle. Flowers terminal or leaf-opposed, 0.6--0.7(--1.3) cm in diam. Pedicel 1--5 cm, glabrous. Receptacle sparsely puberulent. Sepals 5, ovate, 1.8--2.5 mm, glabrous. Petals 5, oblong-obovate, ca. 2.7 × 1.5 mm, nectary pit without a scale, apex rounded. Stamens ca. 13; anthers broadly ellipsoid. Aggregate fruit 3--5 mm in diam.; carpels numerous. Achene obovoid, 1--1.5 × ca. 0.8 mm, glabrous, margin with corky thickening; style persistent, ca. 0.3 mm. Fl. Jun--Jul.
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