Hydrocotyle maritima Honda; Hydrocotyle ramiflora var. maritima (Honda) M. Hiroe.

Stem 10–26 cm, creeping, thin and slender, distal parts decumbent. Petiole 1–15 cm; leaf blade orbicular or round-reniform, shallowly 5–7-lobed, lobes obtuse-orbicular or slightly deltoid, 0.8–2.3 × 1.6–4.5 cm, both surfaces sparsely hirsute or glabrous, base narrowly cordate with basal lobes overlapping. Umbels many-flowered, solitary at nodes; peduncle 1–2-times longer than petiole. Pedicels ca. 2 mm. Petals white with bright yellow glands. Styles incurved when young, strongly spreading when mature. Fruit purplish red when young becoming brown to dark purple, cordate-globose, 1–1.9 × 1.9–2.1 mm. Fl. and fr. Jun–Aug.

Woods, wet grassy places; 500–800 m. Taiwan (Taibei), Zhejiang (Tianmu Shan) [Japan; introduced in NE India, S Russia, and SW Turkey].