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Stems ± 3 mm. diam., decumbent to suberect. Lvs on short petioles 2–6 cm. long, retrorsely pilose towards sinus. Lamina pilose on both surfaces, 20–25–(30) mm. diam.; lobes 5–7, us. very to rather shallow, us. again shallowly lobulate, member., pale green; margins crenulate to denticulate. Sinus us. deep, narrow. Peduncles rather stout to slender, 1–3 cm. long. Umbels c. 8–12-fld. Rays very short, occ. up to 5 mm. long. Fruiting heads up to 1 cm. diam.; frs c. 2–3 mm. diam., dull brown, very turgid, glab.; mericarps grooved in face (often obscurely so), faintly keeled.
[From: Allan (1961) Flora of New Zealand. Volume 1 as Hydrocotyle novae-zeelandiae var. robusta (Kirk) Cheeseman]