Hydrocotyle callicarpa

Slender, erect, annual, to 9 cm high, sparsely hairy to glabrous; stems often branching from base. Leaf-lamina reniform, discolorous, 2–10 mm across, shallowly 3–5-lobed or lobed to c. midway; lobes entire or 3-toothed, each tooth with an often caducous bristle at apex; petiole 1–10 mm long; stipules scarious, fringed, white. Umbels simple, leaf-opposed, 2–3 mm diam., 3–15-flowered; peduncle 2–10 mm long; pedicels 0.5–1.5 mm long. Petals white to purple. Fruits 0.5–1 mm long and wide, smooth, dark; mericarps with keeled dorsal rib, intermediate ribs prominent but not keeled, bordering a narrow pouch toward the junction of the 2 mericarps. Flowers Sep.–Nov.