Small annual herbs, (1.5–)5–20 cm tall; stems erect, diffuse or prostrate, quadrangular, somewhat rooting at nodes, glabrous except pubescent at nodes. Leaves pinnately nerved; sessile; lamina oblong, elliptic or elliptic-oblong, 0.9–6 x 0.3–1.5 cm, apex acute, often rounded, base attenuate or cuneate, margins serrate-aristate, glabrous or often sparsely hirsute beneath. Inflorescences terminal raceme; pedicel 3–8 mm long, not deflexed in fruit; bracts linear-lanceolate, 3–7 mm long. Calyx 4–5 mm long, 5-lobed; lobes divided to the base, linear-lanceolate, apex acuminate, glabrous, margins ciliate or rarely pinnatifid. Corolla white or lilac with pinkish patch at lower lip, 6–7 mm long; minutely capitate glandular at corolla tube; upper lip oblong, apex truncate, 1–1.2 mm wide; lower lip broadly 3-rounded lobes, 4–5 mm wide. Stamens 2 fertile, 2 staminodes; posterior filaments straight, glabrous, 0.9‒1.2 mm long, anterior filamrnts filliform, 0.9‒1.2 mm long. Capsules cylindric, glabrous, 7–15 x 0.5–1 mm, 2–3 times longer than calyx lobes. Seeds numerous, narrowly ellipsoid, ovoid, obovoid, cylindric, ellipsoid or subglobose, 0.36‒0.64 x 0.26‒0.48 mm, pitted.
India, Nepal, Myanmar, China, Laos, Cambodia, Vietnam, Malaysia, Indonesia, Philippines, Australia
Open areas, in paddy fields, field crops, lawn, exposed in forest; flowering thought out the year but rarely found in March‒June