Tufted or stoloniferous perennial, procumbent; roots fibrous. Leaves with petioles 0.5–8 cm long, glabrous to pilose; lamina ± broadly ovate in outline, 4–20 mm long, divided into 3–5 linear segments 0.5–2 mm wide; lateral segments often 2-or 3-fid, glabrous to sparsely pilose. Flowering stems 1-flowered, 1–8 cm long. Sepals 5, rarely 6, spreading, ± elliptic, 2–5 mm long, usually pilose beneath. Petals 5 (–12), obovate-cuneate, 3.5–8 mm long, white to cream; nectary near petal-base, in a small semilunar pocket, with lobe usually absent, or occasionally to 0.2 mm long. Stamens 8–35. Pistils 9–25. Receptacle glabrous in stamen zone, hirsute above. Achenes lenticular, elliptic to ovate, 2–2.4 mm long, smooth; beak 0.5–1 mm long, erect or incurved, with tip often recoiled.
Grows in mud in small depressions subject to periodic flooding, in swamps, fens and in wet mossy patches at margins of bogs; above 1450 m alt.
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