Annual or short-lived perennial herb, erect to decumbent, 0.05–0.4 m tall. Leaves petiolate; blade broadly ovate or broadly elliptic, up to 7–25 × 5–20 mm, apex rounded, obtuse or subacute, base attenuate, margin crenate, often slightly revolute. Cymes 2–3-flowered; pedicels 2–3 mm long, slightly flattened. Fruiting calyx 3–4.5 mm long, open, villous in the throat; lateral lobes narrowly deltoid, slightly acuminate, shorter than the lower lobes. Corolla 4-lobed, 3–4.5 mm long, white, pink or bluish; upper lobe slightly broader than the other lobes. Nutlets 1.2–1.5 × 0.6–0.8 mm, brown, producing a small amount of mucilage when wet.