Glab. branching herb up to 2 dm. or more long; stems creeping, rooting at nodes, sts floating; stock slender to stout, erect or ascending, sts moniliformly thickened. Radical lvs in tufts at nodes, on slender to filiform petioles 2-10-(15) cm. long; sheath membr., delicate. Lamina obovate-cuneate to suborbicular to reniform in outline, 0·5-4 cm. diam.; flabellately divided to base into 3-5-(7) segs; these narrow-cuneate to linear ± deeply toothed, rarely entire. Lower cauline lvs similar, smaller; upper reduced to bracts 1 cm. or less long. Peduncles lf-opposed, 4-10 cm. long; fls 5-7-(10)mm. diam., solitary or paired; sepals 5, spreading, 3-5 mm. long; petals 5-10, yellow, 3-6 mm. long, narrow-oblong; gland 1 well above base. Fruiting heads globose, ± 7 mm. diam.; receptacle glab.; achenes ± turgid, glab., 1·5-2 mm. long, keeled, obliquely obovoid; style 1·5-2 mm. long, subulate, ± recurved at apex.

2n = 96

2n = 96

2n = 96

Perennial; rosettes tufted along creeping stems; nodes not usually bulbous. Basal lvs with slender erect or ascending petioles (2)-5-10-(15) cm long; lamina ternate, glabrous, ± circular, 1-2 cm diam.; leaflets sessile, obtriangular, bluntly 3-fid up to 1/2 way, sometimes again bluntly toothed, ± equal. Lvs of flowering stems ternate with linear acute entire leaflets. Fls 1-4-(7) per stem, 7-12 mm diam.; pedicels glabrous. Sepals spreading, glabrous. Petals 4-5, yellow, narrowly oblong, shortly clawed; nectary single, 1-1.5 mm from petal base, with a short semilunar scale. Receptacle with a basal collar of bristles. Achenes 10-20-(30), hardly flattened, glabrous; body 1.5-2 mm long, obscurely wrinkled when ripe; beak straight or curved, 1-1.5 mm long.