Annual to perennial, prostrate or straggling herb, with stems up to 60 cm long, with a slender taproot; stem few- to much-branched, fleshy, green, often flushed with red, finely hairy or glabrescent, nodes swollen. Leaves opposite, simple, unequal; stipules absent; petiole 0.5–1.5 cm long; blade broadly ovate to elliptical, 1–2.5 cm × 0.5–1.5 cm, base cuneate, rounded or truncate, apex rounded to acute, margins sinuate, pale green to whitish beneath, finely hairy, glandular hairy or glabrescent. Inflorescence an axillary, congested, irregular umbel or cyme, (3–)5–7(–13)-flowered; peduncle (2–)4–7 cm long; bracts and bracteoles small, fimbriate, caducous. Flowers bisexual, regular; pedicel (0–)1–1.5 mm long; perianth tubular-campanulate, distinctly constricted halfway, lower part ellipsoid, surrounding the ovary, 5-ribbed, green, upper part 5-lobed, up to 3.5 mm × 3 mm, lobes emarginate, white, pink or mauve, soon falling; stamens ( 1–)2(–3), slightly exserted; ovary superior, seemingly inferior, 1-celled, style slightly exserted, stigma head-shaped. Fruit an achene enclosed by the thickened lower part of perianth (collectively called anthocarp); anthocarp obovoid to ellipsoid, 3–3.5 mm × 1.5–2 mm, apex rounded, 5-ribbed, with rounded ribs, with glandular hairs all over, 1-seeded. Seed ovoid, pale brown. Seedling with epigeal germination. |