Hydrocotyle rugulosa

Slender, erect or ascending, glabrous annual, 2–12 cm high, often tinged dark purple, often branched at base, often almost leafless in fruit. Cotyledons 2.4–3 mm long, c. 1 mm wide, oblong, usually retained until plant in fruit. Leaf-lamina 4–9 mm across, divided to below middle (or, in upper leaves to base) into 3 lobes; lobes entire, 3-dentate or lateral lobes to deeply 3-lobed; petiole 2–15 mm long; stipules membranous, narrow-ovate, fringed, white. Umbels simple, leaf-opposed, globose, 2–3 mm diam., 2–4-flowered; peduncle 2–10 mm long; pedicel to 0.5 mm long. Petals c. 0.5 mm long, white to purple. Fruits flattened, dark, c. 0.9 mm long, c. 1.3 mm wide, surface slightly colliculate; mericarps with very obtuse and thick dorsal and intermediate ribs connected by 2 or 3 thick, blunt transverse ridges with 2–4 deep depressions between them on each side of the dorsal rib, each depression often with a minute white ridge-like protuberance. Flowers spring.