Small annual herbs, 5–27 cm tall; stems stout, erect, diffuse or ascending with rooting at nodes, glabrous, pubescent at nodes. Leaves distinct 3-palminerved; sessile; lamina narrowly ovate to ovate-lanceolate, glabrous, 7–12 mm long, 3–5 mm wide, apex acute, base truncate, margins entire or sometime with 1–2 pairs of inconspicuous teeth. Flower solitary and axillary; pedicel glabrous, 1.2–3.5 cm long. Calyx deeply 5-lobed almost to the base; lobes linear to lanceolate, apex acute to acuminate, glabrous, 2–4 mm long. Corolla white-mauve with purple on lower lip, 9–12 mm long; upper lip emarginsate, apex obtuse, 2–2.5 mm wide; lower lip 3-lobed, lobes ovate, 5–7 mm wide. Stamens 4, 2 posterior fertile, arising at upper lip, filaments straight, ca. 2 mm long; 2 anterior staminodes arising at lower lip with clavate spur, 1.5–2 mm long with villous hairs along the corolla tube; cleistogamous flowers not present. Capsules oblique turbinate with persistent style at the apex, apex acute, 4–7 mm long, 1.5–2 mm in diam., longer than calyx lobes. Seeds numerous, yellow, fusiform or cylindric, 0.37–0.45 x 0.20–0.26 mm, reticulate.
India, Nepal, Sri Lanka, China, Indo-China, Indonesia
Open and wet places in paddy fields; 800–1,200 m altitudes