Hydrocotyle laxiflora Masamune (1932), not de Candolle (1830); H. masamunei M. Hiroe.

Stem creeping, younger branches erect, stems, petioles and peduncles retrorse villous with white or purplish hairs. Petioles 0.8–2.5 cm; leaf blade reniform to cordate, 7–13 × 8–16 mm, shallowly 7-lobed, lobes rounded, adaxially densely to moderately setulose, abaxially pubescent or hispid. Umbels many-flowered, densely capitate, solitary at nodes; peduncles 1.8–4 cm, 1.5–2 times petioles. Pedicels very short, ca. 1 mm. Fruit cordate or globose, 1–1.5 × 1.5–1.8 mm, smooth. Fl. and fr. Apr–Nov.

Forests, mountain slopes, grassy places, damp mossy rocks; 1500–3000 m. Taiwan.